exhaust wrap Archives - Kool Wrap Heat Protection

How Long Do Exhaust Wraps Last?

How long does exhaust wrap last? Quality exhaust wrap typically lasts 2 to 5 years. Where yours lands in that range comes down to four things. How dry it stays, whether oil or fuel reaches it, how well it was fitted, and how hot the pipe runs compared with the wrap’s rating.

This guide explains what shortens wrap life, how the materials compare, the signs it is time to replace, and how to get more years from the next wrap. You will find ratings and roll sizes for every material in the Kool Wrap exhaust heat wrap range.

What shortens exhaust wrap life

Trapped moisture

Wrap soaks up water from rain, creek crossings, washing and condensation. On a vehicle you drive often and hard, the heat drives that water out. Trouble starts when the wrap stays damp. A weekend car in a cold shed, a 4WD after a river crossing, or a ute that only does short trips never gets the pipe hot for long enough. Water held against mild steel speeds up rust, and the rust then stains the wrap from the inside.

Oil and fuel contamination

A weeping rocker cover gasket or a messy oil change drips straight onto extractors. Wrap absorbs oil and fuel. Once it is soaked, it smokes and smells every time it heats up, and it becomes a fire risk. Replace oil-soaked wrap straight away and fix the leak first.

Abrasion

Wrap that rubs on a chassis rail, crossmember, engine mount or heat shield wears through. Off-road, rocks and scrub tear at exposed wrap under a 4WD. Wrap near a flex joint gets worked every time the exhaust moves, which is one reason to leave flex joints bare.

Loose fitting

Loosely wound wrap moves on the pipe, lets water sit between the turns and frays at the edges. Once a turn lifts, the rest follows. Keep tension even, overlap about 6mm per turn and lock both ends with stainless ties.

Heat beyond the rating

Every wrap has a continuous temperature rating. Run a pipe above it for long periods and the fibres break down faster. Turbo systems, race use and heavy towing push more sustained heat through the pipe than highway cruising does.

Where on the exhaust the wrap wears first

Wrap does not fail evenly along a system. Check these places first.

Location	Why it wears	What you will see
Extractor primaries near the head	Hottest part of the system and closest to oil leaks	Brittle weave, oil staining, discolouration
The outside of tight bends	Thinnest coverage and most tension during fitting	Gaps opening between turns, frayed edges
Under the car near the floor	Road spray, stone chips and water	Damp wrap, rust bleed, torn edges
Where wrap passes a mount or crossmember	Rubbing every time the exhaust moves	A worn line across the weave
Mufflers and rear sections	Runs cooler, so water sits in the wrap instead of drying out	Sagging, loose ties, damp patches

Rear sections and mufflers run cooler than the headers, so water is the main thing that shortens wrap life there rather than heat.

How material choice affects lifespan

Choose a wrap with headroom above how hot your pipe runs for long periods. A wrap working near its limit on every drive will not last as long as the same wrap running well inside it.

Wrap	Continuous	Intermittent	Colours
Standard fibreglass	540°C	980°C	Black, white, natural
Vermiculite coated fibreglass	650°C	1,090°C	Graphite black
Titanium basalt fibre	980°C	Not published	Natural, black

Standard fibreglass

The everyday wrap for street cars, bikes and general use. It comes in 25mm and 50mm widths at 1.5mm thick.

Vermiculite coated fibreglass

Vermiculite coated fibreglass exhaust wrap is fibreglass coated with a vermiculite dispersion. The coating lifts the continuous rating to 650°C, which gives more headroom on hotter street and performance systems. It comes in 50mm width only.

Titanium basalt fibre

Titanium basalt fibre exhaust wrap is made from basalt, a volcanic rock, spun into fibre. It carries the highest continuous rating in the range at 980°C, and Kool Wrap’s product listing describes it as 25% stronger than regular wraps. Pick it for turbo dump pipes, race cars and industrial pipework.

Signs your exhaust wrap needs replacing

Check the wrap every time the vehicle is on a hoist or due for an oil change. Replace it if you see any of these:

Cracking or splitting across the weave
Frayed edges or turns that have lifted and unravelled
Brittle wrap that crumbles when you press it
Dark, oily patches or a burnt oil smell when the engine is hot
Loose, broken or missing ties
Rust stains bleeding through the wrap
Wrap that has been soaked and stays damp
Smoke that continues long after the first few heat cycles

A new wrap smokes for its first few heat cycles as binders burn off. Smoke after that points to oil or fuel in the wrap.

How to make exhaust wrap last longer

Fix oil and fuel leaks before you wrap.
Clean the pipe and coat mild steel with high-temperature exhaust paint before wrapping.
Fit the wrap tight and even, with about 6mm overlap per turn.
Lock both ends with stainless steel ties. Rolls come with 4, 6 or 10 ties depending on size.
Optionally seal the finished wrap with high-temperature exhaust paint to lock down loose surface fibres.
Keep it dry. After a wet drive or a wash, drive long enough to get the exhaust fully hot. Do not aim a pressure washer at wrapped pipe.
Keep the wrap clear of anything it can rub on.
Check the ties and edges at every service.

Most early failures trace back to fitting and moisture. Our guide to whether exhaust wrap can damage extractors explains how to protect the pipe underneath as well as the wrap.

Re-wrapping: the short version

Let the exhaust cool fully. Cut the ties and unwind the old wrap. Wear gloves and long sleeves, because old wrap sheds fibres.
Inspect the bare pipe for cracks, rust and leaks. This is your chance to see what the old wrap was hiding.
Wire brush loose rust, clean off oil and paint mild steel.
Wrap with fresh material and new stainless ties. Cut ties cannot be reused.
Expect light smoke on the first start as the new wrap’s binders burn off.

For the full method, including how much wrap to buy and how many ties you need, follow our step-by-step exhaust wrap install guide.

Exhaust wrap lifespan FAQs

How long does exhaust wrap last?

Quality exhaust wrap typically lasts 2 to 5 years. A street car that gets driven regularly and stays dry sits at the top of that range. A weekend car in a damp shed, a 4WD that crosses water, or wrap near an oil leak sits at the bottom.

How often should exhaust wrap be replaced?

Replace it when it shows the signs above rather than on a fixed schedule. Inspect it at every service and note the date you fitted it, so you know how old it is.

Can you reuse exhaust wrap?

No. Once wrap has been through heat cycles it is brittle, and unwinding it damages the weave. The stainless ties cannot be reused either, because you cut them to remove them.

Does exhaust wrap go bad if the car sits?

It can. A car that sits gets condensation on the pipes and never runs hot enough to dry the wrap out. That is the single most common reason wrap fails early on a weekend car.

Why is my exhaust wrap still smoking?

Light smoke over the first few heat cycles is binders burning off and it clears. Smoke that keeps going, or smells of burnt oil or fuel, means something has soaked into the wrap or an exhaust leak is blowing onto it. Find the source before you keep driving.

Need help choosing?

Not sure whether your wrap is due, or which material will last longer on your setup? Send Kool Wrap a photo or call 1300 44 33 34. Replacement rolls in all three materials are in the exhaust heat wrap range.

Is an Exhaust Wrap Worth It?

If you’re into modifying your vehicle for performance or aesthetics, you might have come across exhaust wraps. But the big question is: is exhaust wrap worth it?

The answer depends on what you want the wrap to achieve. Exhaust wrapping can reduce radiant heat around the exhaust, help protect nearby wiring and components, reduce heat entering the cabin or engine bay, and give your exhaust a different look. It also has some drawbacks, particularly moisture retention, installation and ongoing wear.

This guide breaks down the exhaust wrap pros and cons, what exhaust wrap actually does, who benefits most from it, and what to consider before you buy.

What is Exhaust Wrap?

Exhaust wrap is a heat-resistant material that you wind around an exhaust pipe. It is usually made from woven fibreglass or basalt fibre and comes in rolls in different widths, materials and temperature ratings.

The main purpose of exhaust wrap is to keep more heat inside the exhaust pipe and reduce the amount of radiant heat released into the surrounding area.

That can be useful when an exhaust runs close to wiring, hoses, plastics, the firewall, cabin floor, fuel lines or other heat-sensitive components.

Kool Wrap supplies exhaust wrap for cars, 4WDs, motorcycles, performance vehicles, marine applications and industrial equipment.

Benefits of Exhaust Wrap

There are several potential benefits of exhaust wrap, particularly when you have a specific heat-management problem to solve.

1. Reduced Radiant Heat

One of the main reasons for exhaust wrapping is to reduce the radiant heat coming off the pipe.

When an exhaust is wrapped, less heat radiates directly onto nearby components. This can help protect wiring, hoses, sensors, starter motors, plastics and other parts that sit close to hot exhaust components.

This can be particularly useful in tight engine bays where there is limited space between the exhaust and surrounding components.

2. Lower Under-Hood Temperatures

A wrapped exhaust can reduce the amount of radiant heat released into the engine bay.

This can help reduce heat exposure around sensitive components and may be useful where extractors, headers or other exhaust components sit close to the intake, wiring or other heat-sensitive parts.

The goal is heat management rather than a guaranteed performance increase.

3. Reduced Cabin and Floor Heat

Exhaust systems that run underneath the cabin can transfer significant heat into the floor and transmission tunnel.

Wrapping accessible sections of the exhaust can reduce the radiant heat reaching the surrounding bodywork.

This can be particularly useful in 4WDs, utes, vans and other vehicles where the exhaust runs close to the cabin floor.

For a van exhaust insulation project, for example, exhaust wrap can be one part of a broader heat-management setup. A heat shield on the floor or body panel can also be appropriate depending on where the heat problem occurs.

4. Protection for Nearby Components

Exhaust heat can affect components that sit close to the pipe.

Wrapping can help reduce heat exposure around:

Wiring and electrical components
Fuel lines
Brake lines
Hoses
Plastic components
Starter motors
Engine bay panels

The wrap works on the exhaust pipe itself. If the main problem is heat reaching a particular panel, firewall or floor, a dedicated heat shield may be a better solution.

5. A Different Exhaust Appearance

For many vehicle owners, appearance is also part of the decision.

Exhaust wrapping can give headers, extractors and other exhaust sections a uniform finished appearance, particularly where the original pipes are discoloured, stained or showing surface wear.

Kool Wrap offers different materials and finishes, including black, white, natural and graphite black, depending on the product.

Potential Downsides of Exhaust Wrap

The pros and cons of exhaust wrap need to be considered together. While wrapping can solve a genuine heat problem, it is not suitable for every exhaust or application.

1. Moisture Retention

One of the main concerns with exhaust wrapping is moisture.

Exhaust wrap can absorb water from rain, washing, condensation and water crossings. If moisture remains against bare mild steel, it can accelerate corrosion.

For mild steel exhaust components, clean the pipe and apply a suitable high-temperature exhaust paint before wrapping. After a wet drive or wash, allow the exhaust to get hot enough to dry the wrap.

Vehicles that regularly cross water or sit for long periods in damp conditions need particular attention.

2. Installation Takes Time

Wrapping exhaust pipes is not difficult, but it requires patience.

The wrap needs to be installed with firm, even tension and consistent overlap. Bends, brackets and tight spaces can make the job more difficult.

You will generally need:

Exhaust wrap
Stainless steel ties
Gloves and long sleeves
Safety glasses
Scissors
Degreaser and cleaning equipment
High-temperature exhaust paint for mild steel

If you are unsure about the process, follow a proper installation guide before starting.

3. Exhaust Wrap Wears Out

Exhaust wrap is not a permanent covering.

Quality exhaust wrap typically lasts around 2 to 5 years, depending on the material, temperature, moisture, oil contamination, installation and use.

Signs that your wrap may need replacing include:

Fraying or splitting
Loose sections
Brittle or crumbling material
Oil staining
Rust stains coming through the wrap
Broken or loose ties
Wrap that remains damp

If you want to know how long exhaust wrap lasts and what affects its lifespan, it is worth checking the full guide before deciding which material to use.

Does Exhaust Wrap Improve Performance?

You may see claims that keeping exhaust gases hotter automatically increases horsepower and torque. That is not a claim we recommend making without testing the specific engine and exhaust system.

Exhaust wrap is primarily a heat-management product.

Keeping heat contained within the exhaust can reduce radiant heat around the pipe and may be useful in applications where surrounding temperatures are a concern. However, there is no universal horsepower increase that can be attributed to exhaust wrap alone.

If your goal is performance, consider the entire exhaust system, engine setup, intake system and tuning rather than treating wrap as a standalone power modification.

Does Exhaust Tape Work?

If you have been searching for does exhaust tape work, it is important to distinguish exhaust wrap from exhaust repair products.

Exhaust wrap is designed to insulate an exhaust pipe and reduce radiant heat.

An exhaust repair tape is generally intended as a temporary repair or sealing product for damaged exhaust components. It is not a replacement for proper exhaust wrap.

Likewise, an exhaust wrap should not be treated as a permanent repair for a cracked, leaking or damaged exhaust. Repair the exhaust first, then wrap it once the pipe is sound.

Is Exhaust Wrap the Same as Sound Deadening Wrap?

No.

You may come across searches for exhaust sound deadening wrap, but exhaust wrap is primarily designed for thermal insulation, not acoustic insulation.

If you are trying to reduce exhaust noise, the appropriate solution depends on the source of the noise and the exhaust system itself. Exhaust wrap should not be selected or marketed as a sound-dampening product.

What About Header Wrap?

Header wrap is simply exhaust wrap applied to headers or extractors.

Headers are often wrapped because they generate significant radiant heat and can sit close to sensitive components in a compact engine bay.

Before wrapping headers, inspect them for cracks, rust and leaks. Mild steel headers should be properly cleaned and painted before wrapping.

If you are concerned about whether wrapping can affect your headers, read our guide on whether exhaust wrap can damage extractors or headers.

Who Can Benefit From Exhaust Wrapping?

Exhaust wrapping can be useful when you have a specific heat problem to solve.

Performance and Modified Vehicles

Turbo systems, extractors and performance exhausts can generate significant heat in a compact engine bay.

Wrapping selected exhaust sections can help reduce radiant heat reaching nearby components.

4WDs and Utes

A 4WD or ute may have exhaust components running close to the cabin, fuel system, wiring or underbody components.

Exhaust wrap can form part of a broader heat-management setup, particularly where floor or transmission tunnel temperatures are noticeable.

Vans

For van exhaust insulation, wrapping the exhaust can help reduce radiant heat from sections running close to the cabin or bodywork.

Where heat is reaching the interior through a body panel, combine exhaust wrap with a suitable heat shield on the panel itself.

Motorcycles

Motorcycle headers often run close to the rider’s leg, boot, fairings and wiring.

Exhaust wrap can reduce radiant heat in these areas. For bike-specific material choices, measurements and installation instructions, see our motorcycle exhaust wrap guide.

When Should You Avoid Exhaust Wrap?

Exhaust wrap is not automatically the right answer for every exhaust system.

Think carefully about wrapping if:

The exhaust is bare mild steel and regularly exposed to water.
The vehicle sits for long periods while the wrap remains damp.
The pipe has existing cracks, rust holes or leaks.
You need to inspect the exhaust frequently.
You are dealing with extremely high sustained temperatures beyond the wrap’s rating.

Fix exhaust problems before wrapping them. Wrap should manage heat, not hide an existing mechanical problem.

How to Get the Most From Exhaust Wrap

A few installation practices can make a significant difference.

Clean the exhaust thoroughly before wrapping.
Repair cracks and leaks first.
Paint bare mild steel with high-temperature exhaust paint.
Use firm, even tension when wrapping.
Maintain about 6mm overlap between turns.
Secure the wrap with stainless steel ties.
Keep flex joints and O2 sensors clear.
Allow wet wrap to dry properly after washing or water crossings.
Inspect the wrap regularly for damage, oil contamination and rust.

For the complete installation process, follow our step-by-step exhaust wrap install guide.

Exhaust Wrap Pros and Cons: Quick Summary

The main exhaust wrapping pros and cons come down to what you are trying to achieve.

Pros:

Reduces radiant exhaust heat.
Helps protect nearby components.
Can reduce heat reaching the cabin floor.
Can help manage heat in tight engine bays.
Provides a different exhaust appearance.

Cons:

Can hold moisture against mild steel.
Requires careful installation.
Needs periodic inspection and eventual replacement.
Can hide cracks, corrosion and leaks underneath.
Does not make an exhaust safe to touch.

Exhaust Wrap FAQs

Is exhaust wrap worth it?

Is exhaust wrap worth it? It depends on your application and what you want it to achieve. If you have a specific heat problem around your exhaust, such as a hot cabin floor, wiring close to the headers or excessive radiant heat around an engine bay, exhaust wrap can be a useful heat-management solution.

If you have no particular heat problem, the main reason to use it may simply be appearance.

What are the pros and cons of exhaust wrap?

The main exhaust wrap pros and cons are straightforward. Wrap can reduce radiant heat and protect nearby components, but it can also retain moisture, wear over time and make the underlying exhaust harder to inspect.

Does exhaust wrap increase horsepower?

Exhaust wrap should not be treated as a guaranteed horsepower modification. It is primarily designed to manage radiant heat around the exhaust. Any performance effect depends on the specific engine, exhaust system and operating conditions.

Does exhaust tape work?

If you mean exhaust repair tape, it is different from exhaust wrap. Repair tape is generally used for temporary exhaust repairs, while exhaust wrap is designed for thermal insulation. Exhaust wrap should not be used to repair a cracked or leaking exhaust.

How long does exhaust wrap last?

Quality exhaust wrap typically lasts around 2 to 5 years, depending on heat, moisture, contamination, installation and vehicle use. Regular inspection can help identify when it needs replacing.

Does exhaust wrap cause rust?

Exhaust wrap does not create rust by itself, but it can hold moisture against the pipe. On bare mild steel, that moisture can accelerate corrosion. Proper preparation, high-temperature paint and keeping the wrap dry can reduce the risk.

What is wrapworth?

If you are asking whether exhaust wrap is worth the cost, the answer depends on the heat problem you are trying to solve. The value comes from heat management, component protection and the finish you want, rather than a guaranteed performance gain.

I’ve got exhaust heat around my vehicle. Should I use wrap?

If you’ve got exhaust heat reaching wiring, hoses, body panels, the cabin floor or other sensitive components, wrap may help reduce the radiant heat coming from the pipe.

However, if the heat is mainly reaching a specific panel or surface, a dedicated heat shield may be more appropriate. The right solution depends on where the heat is coming from and what you are trying to protect.

Final Thoughts

So, is exhaust wrap worth it?

For the right application, it can be a practical way to manage radiant exhaust heat, protect nearby components and change the appearance of your exhaust system.

The key is to understand what exhaust wrap can and cannot do. It is a heat-management product, not a guaranteed horsepower upgrade, exhaust repair product or sound-deadening material.

If you decide to wrap your exhaust, choose a material suitable for the operating temperature, prepare the pipe properly and follow the installation process carefully.

Browse the Kool Wrap exhaust wrap range or contact Kool Wrap on 1300 44 33 34 if you need help choosing the right material for your application.

Addressing Common Misconceptions About Exhaust Wrap

Exhaust wrap is widely discussed in the automotive world, often surrounded by various myths and misconceptions. As a leading heat shield and exhaust wrap solutions provider, Kool Wrap is here to set the record straight. This blog post addresses and debunks some of the most common misconceptions about exhaust wrap, clarifying its benefits and dispelling misinformation.

Misconception 1: Exhaust Wrap is Only for Aesthetics

One common misconception is that exhaust wrap is solely used for cosmetic purposes, giving vehicles a “cool” look. While it’s true that a well-wrapped exhaust can have an appealing appearance, its benefits go far beyond aesthetics. Exhaust wrap is primarily employed to manage heat. It helps reduce under-hood temperatures, protect nearby components, and improve overall engine performance.

Misconception 2: Exhaust Wrap Causes Corrosion

Some believe wrapping the exhaust can trap moisture and lead to rust or corrosion. However, modern exhaust wrap materials are designed to resist moisture and heat. When correctly installed, they create a barrier that minimises the chance of moisture accumulation, preventing corrosion rather than causing it.

Misconception 3: Exhaust Wrap Decreases Exhaust Life

There’s a notion that exhaust wrap can accelerate wear and tear on the exhaust system due to increased heat retention. In reality, well-engineered exhaust wrap materials are designed to withstand high temperatures. They are often used in racing and high-performance applications precisely to prolong the life of the exhaust by reducing thermal stress.

Misconception 4: Exhaust Wrap Always Leads to Performance Gains

While exhaust wrap can improve performance by reducing heat soak and enhancing exhaust gas flow, it’s not a magic solution that guarantees horsepower gains on every vehicle. The extent of performance improvement can vary based on factors such as the engine’s design, the wrap’s quality, and the vehicle’s overall setup.

Misconception 5: Exhaust Wrap Is Only for Racing Vehicles

Another misconception is that exhaust wrap is exclusive to racing vehicles. While it’s true that race cars often utilise exhaust wrap for performance reasons, it’s equally valuable for regular daily drivers. Exhaust wrap can help prevent heat-related damage, increase fuel efficiency, and even reduce cabin heat, making it beneficial for all types of vehicles.

Benefits of Exhaust Wrap

Heat Management: Exhaust wrap effectively reduces under-hood temperatures, leading to improved engine performance, reduced heat-related issues, and enhanced overall reliability.

Protection: By shielding nearby components from excessive heat, exhaust wrap prevents potential damage and extends the life of various parts.

Performance Enhancement: While not a guaranteed horsepower boost, exhaust wrap can improve exhaust gas flow, contributing to a smoother-running engine.

Fuel Efficiency: Cooler air entering the engine bay can improve fuel combustion efficiency, potentially leading to better fuel mileage.

Cabin Comfort: Lower under-hood temperatures translate to cooler cabin interiors, making your driving experience more comfortable.

Conclusion

Exhaust wrap is a practical and beneficial solution that extends beyond aesthetics. It manages heat, protects components, and enhances vehicle performance. By addressing and debunking common misconceptions, we hope to clarify the advantages of using exhaust wrap. At Kool Wrap, we offer high-quality heat shield and exhaust wrap products to help you make informed decisions for your vehicle’s well-being and performance.

How Hot Does My Exhaust Pipe Get?

How Hot Does an Exhaust Get? The Real Temperatures Explained

The highest temperatures that an exhaust manifold or exhaust pipe can reach are approximately 850°C (1,600°F).
As a general reference, metals start to turn red at 500°C and glow a dark cherry red at around 635°C (1,175°F).

Where Does the Exhaust Get the Hottest?

The hottest parts of your exhaust system are usually:

A bend in the exhaust pipe near the cylinder head
Around the catalytic converter

As RPM or engine load increases, exhaust temperatures naturally rise — this is when the engine burns the most fuel and produces maximum torque or horsepower.

Typical Exhaust Temperatures in Road Cars | How Hot Does Your Exhaust Get?

Tests show that for typical road vehicles:

Around 120°C (250°F) at 50 km/h (30 mph)
Up to 550°C (1,020°F) at 112 km/h (70 mph)

How to Prevent Heat Damage in the Engine Bay

There are three main ways to protect nearby components from exhaust heat:

Insulate the exhaust pipe to retain heat within the pipe.
Install a reflective barrier with an air gap between the exhaust pipe and other components.
Add reflective and insulating materials to heat-sensitive parts that may be exposed to radiant exhaust heat.

Using Exhaust Wraps to Reduce Heat

We typically use exhaust wraps or tapes in a spiral pattern around the exhaust pipe or manifold to trap heat inside.
Tests show that exhaust wraps can reduce engine bay temperatures by up to 50%.

Common exhaust wrap materials include:

Fibreglass (melts around 815°C)
Silica
Basalt
Ceramic wraps

Factory Heat Shields in Modern Cars

Many modern cars now feature embossed aluminium or steel heat shields to manage heat effectively.
These shields are mounted 1–2 cm away from the exhaust or manifold, allowing airflow through the gap to carry away excess heat.

Heat Sleeves for Engine Bay Protection

Heat sleeves are used to protect cables, wires, hoses, and hard lines.
They’re typically made of aluminium foil laminated with fibreglass, offering both reflection and insulation.

Some sleeves use Mylar foil, which combines a thin metallic layer with a polyester resin outer layer and fibreglass insulation.
However, Mylar begins to burn off around 200°C (400°F).

At Kool Wrap, a thicker aluminium foil backed by fibreglass insulation is used, capable of withstanding temperatures up to 660°C (1,220°F).
This material comes in both sleeve and sheet forms, ideal for insulating components like starter motors or firewalls.

Why Trapped Air is a Great Heat Insulator

Air is an excellent heat insulator when trapped in small pockets.
It’s a poor conductor of heat but works well in convection (as seen in fan heaters).

Products like styrene foam or ceiling insulation batts trap air to block heat transfer — the same principle applies to exhaust wraps and fibreglass or silica blankets.
The air pockets between fibres reduce heat conduction effectively.

A common household example of this effect is double-glazed windows, which use trapped air to create a thermal barrier.

References

University of Washington: Underhood Surface Temperature Tests – Summary of Published Results

How To Install Our Latest Kool Wrap Exhaust Wrap Insulation

Installing exhaust wrap correctly helps protect nearby components from radiant heat and keeps the wrap secure on the pipe. The process is straightforward, but the details matter: preparation, tension, overlap and tie placement all affect the finished result.

This guide explains how to install exhaust wrap step by step, including how much wrap you need, how to prepare the pipe, whether you need to soak the wrap, how much overlap to use and what to expect when you start the engine.

For available materials, sizes and ratings, see the Kool Wrap exhaust heat wrap range.

What you need to install exhaust wrap

Before starting, gather everything you need so you can complete the job without stopping halfway through.

You will need:

Exhaust wrap
Stainless steel ties
Scissors or a sharp cutting tool
Gloves
High-temperature exhaust paint, if you plan to seal the finished wrap
Jack stands, ramps or a hoist if required
Basic tools for removing the exhaust, if you choose to take it off the vehicle

Work on a completely cool exhaust system. Exhaust components can remain extremely hot long after the engine has been switched off.

If you are removing the exhaust, label or photograph the connections before disassembly so everything can be returned to its original position.

How much exhaust wrap do I need?

The amount of wrap required depends on pipe diameter, pipe length, the number of bends and the amount of overlap.

A useful starting point is to calculate the circumference of the pipe, then allow for the additional length created by wrapping each turn with overlap.

For a straight section:

Wrap length ≈ pipe circumference × number of turns

The number of turns depends on the length of the pipe and the width of the wrap.

As a practical example, one metre of 50mm pipe wrapped with 50mm wrap at approximately 6mm overlap per turn needs about 3.7m of wrap. Add around 10% for bends and tie-offs.

For a four-cylinder set with 38mm primaries approximately 0.8m long, the calculation comes out near 10.2m, so a 15m roll gives you a safer margin.

If you are unsure, measure each pipe section and allow extra material for bends and finishing the ends.

How to install exhaust wrap

1. Remove and clean the exhaust

Remove the headers or exhaust sections if the job allows it. Working on the bench makes it easier to maintain even tension and inspect the entire pipe.

Clean the pipe thoroughly before wrapping. Remove oil, grease, dirt, loose rust and other contamination.

If you are wrapping mild steel, deal with surface corrosion before installing the wrap. Apply high-temperature exhaust paint where appropriate and allow it to cure according to the paint manufacturer’s instructions.

Stainless steel should be clean and free from oil and dirt before wrapping.

2. Measure and plan the wrap

Measure the pipe sections before cutting the wrap.

Start at the narrowest end of the pipe. On a header, this is usually the head end. On a straight exhaust section, it is normally the front.

Plan where your joins, bends and finishing points will be. Avoid placing unnecessary joins in awkward locations.

3. Start the first turn

Fold the first few centimetres of wrap back on itself.

Position the folded end at the starting point and lock the fold underneath the first turn. This helps prevent the cut edge from fraying as you work.

Keep the wrap straight and apply consistent tension as you move along the pipe.

4. Wrap with consistent tension

Work around the pipe one turn at a time.

Pull the wrap firmly enough to keep it secure, but do not stretch it excessively. The goal is an even, consistent fit without loose sections or bunching.

Follow the shape of the pipe through bends rather than forcing the wrap to sit flat where the pipe changes direction.

For complex headers, take your time around the collector and tighter bends. Uneven tension in these areas can create gaps or excessive overlap.

5. Keep the overlap at about 6mm

Overlap each turn by approximately 6mm.

Kool Wrap’s installation guidance allows around 5 to 8mm of overlap. Keeping the overlap consistent gives the finished wrap an even appearance and avoids unnecessarily building up thickness.

Too much overlap adds thickness and can hold more heat and water against the pipe.

6. Use one layer

One layer is the standard fit in the Kool Wrap installation guide.

Adding extra layers increases the thickness around the pipe. It can also hold more heat against the pipe wall and take longer to dry if the wrap becomes wet.

Unless your application specifically requires otherwise, install one even layer.

7. Secure the wrap with stainless steel ties

Secure the wrap at the starting point, along the pipe and at the finishing point using stainless steel ties.

Place the ties where they hold the wrap firmly without cutting into the material.

Tighten each tie securely, then turn or position the lock away from areas where it could contact wiring, boots, hoses or other components.

Check the finished wrap for loose edges or sections before reinstalling the exhaust.

8. Finish the ends carefully

At the end of the pipe, fold the wrap neatly and secure it with a stainless steel tie.

Avoid leaving loose material hanging from the end of the wrap.

Check around flanges, welds and other areas where the wrap may need to be trimmed for a clean fit.

9. Keep sensitive components bare

Do not wrap components that should remain exposed.

Leave O2 sensors and flex joints bare. Leave catalytic converters bare unless the vehicle manufacturer specifically allows them to be wrapped.

The wrap should remain on the appropriate exhaust pipe sections rather than being extended over components that require their own operating or cooling conditions.

10. Consider sealing the finished wrap

You can optionally seal the completed wrap with high-temperature exhaust paint.

This can help lock down loose fibres and protect the finished surface.

Follow the paint manufacturer’s application and curing instructions.

How to heat cycle new exhaust wrap

After installation, reinstall the exhaust and check that the wrap is clear of wiring, hoses, brackets, bodywork and other components.

Start the engine and allow the exhaust to heat gradually.

New exhaust wrap can produce light smoke and an odour during the first heat cycles. This is caused by binders in the material burning off and is generally normal.

The smoke should reduce and clear after the first few runs.

If smoke continues heavily, or you notice an oil or fuel smell, switch the engine off and investigate. Contamination on the wrap or an exhaust leak can produce different symptoms.

If you use a turbocharged vehicle, make sure surrounding components have sufficient clearance. If you also use a turbo blanket, check the manufacturer’s fitting instructions for the complete setup.

How long should you soak exhaust wrap?

You do not have to soak it at all.

Kool Wrap exhaust wrap does not need wetting before installation. Some installers lightly spray wrap because damp material can pull tighter and shed fewer fibres during installation.

If you dampen the wrap, run the engine soon after installation so the heat can dry it out.

Do not leave damp wrap sitting on the exhaust pipe.

How much overlap should exhaust wrap have?

About 6mm per turn is a good target.

Kool Wrap’s installation guide allows approximately 5 to 8mm of overlap.

More overlap than necessary builds additional thickness around the pipe. It can also hold more heat and water against the exhaust.

Aim for a consistent overlap from one end of the pipe to the other.

Do you wrap from the top or the bottom of the pipe?

Start at the narrowest end.

On a header, this is usually the head end. On a straight exhaust section, it is generally the front.

Fold the first few centimetres back on themselves and lock the fold underneath the first turn. This prevents the cut end from fraying as you continue wrapping.

Work towards the wider section while maintaining consistent tension and overlap.

Can you install exhaust wrap without removing the exhaust?

Yes.

Exhaust wrap can be installed while the exhaust remains on the vehicle, particularly when access is good and the vehicle is safely supported.

However, working with the exhaust removed generally makes the job easier. It takes longer to maintain even tension when working underneath a vehicle, and you cannot inspect the far side of the pipe as easily.

If the job allows it, remove the pipes and wrap them on the bench.

Why does new exhaust wrap smoke?

Light smoke during the first heat cycles is normal.

Binders in the wrap burn off as the material reaches operating temperature. You may also notice an odour during the first few runs.

The smoke should reduce and clear after the first few heat cycles.

Smoke that continues, becomes excessive or smells of oil or fuel should be investigated. It may indicate contamination on the wrap or an exhaust leak.

Final checks after installation

Before considering the job finished, check the entire exhaust system.

Look for:

Loose or missing stainless steel ties
Uneven or excessive overlap
Frayed edges
Gaps in the wrap
Wrap touching wiring, hoses or other components
Wrap rubbing against the chassis or engine mounts
O2 sensors or flex joints accidentally covered
Signs of oil or fuel contamination
Exhaust leaks around joints and flanges

Once the system has completed its first few heat cycles, allow it to cool completely and inspect the wrap again.

For information on what to look for as the material ages, read how long exhaust wrap lasts.

If you are also concerned about the condition of the exhaust underneath the wrap, see whether exhaust wrap can damage extractors.

Need help choosing?

Not sure how much wrap your exhaust system needs? Send Kool Wrap your pipe sizes and lengths, or call 1300 44 33 34.

You can compare available wraps, ties and related products in the exhaust heat wrap range.

Formula 1 Exhaust Wrap

We are big Formula 1 fans here at Kool Wrap and we were delighted to see Daniel Ricciardo win the Chinese Grand Prix last week.

The Formula 1 teams are notoriously secretive and we rarely see behind the scenes photos of their technology. But we recently came across this photo of an unidentified Formula 1 engine from winter testing and you can easily see that they have used exhaust wraps or shielding to contain exhaust heat temperatures.

Heat management is extremely important in F1. Air intakes for intercoolers, radiators and oil coolers need to be kept to a minimum as they create aerodynamic drag and cost valuable lap time.

Racing has always been a fantastic test bed for new technology. Many previous inventions find there way onto our roadcars such as disc brakes, seat belts and fuel injection.

Today’s Formula 1 engines have reached amazing new levels of efficiency. If we look at the energy stored in racing fuel (I will not go into how energy is never created, it is just transformed from one place to another) the engine designers job is to convert as much of that stored energy into twisting power. Petrol engines have always been fairly inefficient. When we convert petrol into heat, some of that energy pushes down the piston to turn the crank, but most of that heat energy disappears out of the exhaust pipe or into the cooling system.

A typical petrol engine in a late model car has an efficiency score of around 20%. That means 80% of the thermal efficiency is lost in exhaust gas, friction etc.

Mercedes F1 announced late last year that they have exceeded 50% thermal efficiency. This helps to explain how they can make 900+hp from a 1.6 litre V6 engine!

Advances in heat management have contributed to these efficiency gains. Mercedes have tried to keep as much heat energy inside the exhaust pipes so that it can drive their turbocharger to both create turbo boost pressure but to also generate electricity that can power their hybrid systems.

We will leave Formula 1 engine technology discussions for another blog later this year, but we can expect to see standard roadcars of the future doing a far better job of converting fuel into usable energy.

Kool Wrap Can Prevent Harvester Fires

We had a customer call from Western Queensland and he wanted some wrap to go around a muffler that was causing fires on his harvester.

He said it was common for pieces of dry stalks, crop dust or chaff to gather on the harvester and this was particularly dangerous around exhaust pipes, mufflers and turbo chargers.

In fact, the GRDC (Grain Research and Development Corporation) claim that 7% of harvesters will start a fire EVERY YEAR.

The risk of fire varies depending on the weather conditions, wind direction and the type of crops with Chickpeas being one of the worst offenders.

This problem is not confined to the northern states. We have had reports of similar fire problems in southern states such as Victoria.

Wrapping of hot exhausts and mufflers is one way to reduce the risks.

Other methods include the frequent cleaning of the vehicle with high pressure blowers to reduce the build up of inflammable materials.

Hot Floor in Landcruiser

A hot floor is a common complaint from LandCruiser, Patrol, Hilux and other 4WD and ute owners. You feel it through your boots on the passenger side or across the transmission tunnel. On a long summer run the floor heats the whole cabin.

The fix is rarely one product. Find where the heat is coming from, sort out any faults, then add shielding in the right order. The shields themselves are in the Kool Wrap heat shield range.

Why 4WD floors get hot

The exhaust and catalytic converter run directly under the floor pan, often with little clearance.
Crawling in low range, sitting in traffic or idling at camp moves very little air under the vehicle to carry heat away.
Towing a caravan or heavy trailer loads the engine and keeps exhaust temperatures high for hours.
On diesels with a particulate filter, the filter runs extra hot while it burns off soot.
Aftermarket exhausts, bigger pipes or relocated mufflers can sit closer to the floor than the factory system did.
Missing or damaged factory heat shields let radiant heat hit the floor directly.

Check these before you buy anything

Shielding a fault just hides it. Work through this list first.

Look for missing or damaged factory shields. Get underneath with a torch and check every shield above the exhaust run. A shield hanging by one corner is doing nothing. Refit or replace it before you add anything new.
Check for an exhaust leak. A cracked pipe or a blown gasket puts hot gas straight onto the floor pan. Listen for a ticking on cold start and look for soot marks around joints.
Check clearance. If an aftermarket exhaust sits closer to the floor than the original, moving the hanger or the pipe may fix more than any shield will.
Check the tunnel and floor for old, failed insulation. Factory pads soak up water and fall apart. Strip what is left before you stick anything down.

The order to fix it in

Work from the heat source outwards. Each step does less than the one before it, so do them in order rather than picking one.

Step	What to do	Why it comes here
1	Refit or replace missing factory shields	Free, and it is the shielding the manufacturer already designed in
2	Wrap the accessible exhaust sections	Contains heat at the source, which lowers everything downstream
3	Shield the floor pan from underneath	Reflects what is left away from the cabin
4	Insulate inside the cabin, under the carpet	Slows the heat that still gets through

Wrap the exhaust where you can reach it

Wrapping the sections of pipe that run under the cabin keeps heat inside the pipe instead of radiating it at the floor. Use exhaust heat wrap and secure it with stainless steel ties.

Two warnings for a 4WD specifically. Wrap absorbs water, and a vehicle that crosses creeks will hold that water against the pipe, which speeds up rust on bare mild steel. Paint mild steel pipe with high-temperature exhaust paint first, and after a wet trip drive long enough to dry the wrap out. Leave O2 sensors and flex joints bare.

Our step-by-step exhaust wrap install guide covers how much you need and how to fit it.

Shield the floor pan

This is the step that does the most for a hot floor. Kool Wrap recommends the 5mm heavy duty heat shield for under-car jobs where the exhaust heats the floor. It uses a 0.25mm embossed aluminium face on a 5mm fibreglass and polyester core, reflects up to 95% of radiant heat, and passed a 30-hour oven test at 246°C with no failure. Sheets come in 60 x 50cm and 100 x 58cm.

Fit it to the underside of the floor pan, facing the exhaust. The surface has to be clean, dry and free of oil and wax, which on the underside of a 4WD usually means a proper degrease rather than a wipe. Cut it with heavy duty scissors, press it on from the centre out, roll the edges, and seal every cut edge and join with aluminium foil tape so water cannot creep underneath.

Where the pipe runs very close to the floor, an embossed semi-rigid panel mounted on brackets works better than an adhesive sheet, because it stands off the heat instead of sitting against the panel.

Our adhesive heat shield installation guide covers the full method.

Insulate inside the cabin

With the floor shielded from below, the last step is inside. Lift the carpet and lay sound deadener on the metal, then a foil-faced layer over it. This is the same approach used in a van build, deadener first and a foil-faced layer over it, and it cuts road noise at the same time.

What not to do

Do not remove a factory heat shield because it rattles. Refit it. Our guide to car heat shields covers the fix.
Do not stick an adhesive shield onto the exhaust pipe itself. Kool Wrap does not publish an adhesive temperature rating, so the sheets go on the floor pan, not the pipe.
Do not lay carpet underlay straight onto a hot floor and expect it to help. Without a reflective layer it just holds the heat closer to your feet.

Need help choosing?

Send Kool Wrap a photo of the underside of your vehicle and we will tell you what will fit and in what order. Call 1300 44 33 34, or compare sheets and panels in the heat shield range.