Muffler Delete Ultimate Guide: Cost, Sound, Mileage & Power

What Is Muffler Delete?

Muffler delete is the removal of a vehicle’s muffler. By removing the muffler, the engine noise is no longer suppressed and becomes much louder. 


This is often done for aesthetic reasons, as many people believe that the louder engine noise sounds more aggressive and powerful. 

However, muffler delete can also have negative consequences, such as increased engine wear and tear, and decreased fuel efficiency.

Table below listed summary of the details in this article: –

Price $50 – $200
Tuning Required No
Legal Depends
Drive without muffler No
Gas Mileage No
Horsepower Slightly
Warranty Will not void. (If done properly)
Mod Process Duration Within an hour (by professional)


In the end of this article, I have also injected some of the most frequently asked questions from the readers. Hope it helps. Let’s get started on the topic!

Image of the internals of a muffler
The muffler is responsible for reducing the sound waves that come from the engine. Muffler works by combining sound waves in a way that they cancel out each other.
The chamber plate bounces the sound waves into each other. This action reduces the loudness of the engine exhaust and makes your car silent.

Is Muffler Delete Legal?

The muffler delete is definitely illegal in all 50 states in America. 

Each state handles muffler laws in their own ways. However, every state requires motor vehicles to have a muffler—there’s no getting around it! 

Here’s the exact copy of the law in California: –

“Every motor vehicle subject to registration shall at all times be equipped with an adequate muffler”.

The legality of muffler delete depends on a number of factors, including the jurisdiction in which the vehicle is being operated and the specific regulations that apply in that jurisdiction. 

In some jurisdictions, muffler delete is considered to be an illegal modification to a vehicle’s exhaust system. In other jurisdictions, however, muffler delete may be permitted provided that the vehicle meets certain noise emissions standards.

You must understand whatever the local law says about car noise emission in your locality. As we know, laws vary in different states in the United States and even beyond the United States.

I suggest you do your own research on this one. To make your life easier, here’s a list of laws from different states regarding exhaust noise.

Is It Safe To Drive Without A Muffler?

No, it is not safe to drive without a muffler. 

Image of a muffler on exhaust

A muffler is an important part of a car’s exhaust system, and its purpose is to reduce noise and dangerous exhaust fumes. Without a muffler, the noise from the engine will be much louder, and this can be dangerous for both the driver and other people on the road.

Additionally, the exhaust gases produced by the engine would be more likely to enter the cabin of the car, which could be dangerous to your health if you breathe them in.

Does a Muffler Affect Gas Mileage?

Some studies suggest that a muffler can improve fuel efficiency by up to 5%, while other studies suggest that there is no significant difference. 

The reason for this discrepancy is likely due to the fact that there are many variables that can affect fuel efficiency, such as the type of vehicle, driving habits, and the quality of the muffler.

A muffler is designed specifically to reduce the noise emitted by an engine by directing exhaust gases through a series of chambers and baffles. This process of redirecting and dissipating the energy of the exhaust gases results in a decrease in noise output. Therefore, there is no clear consensus on whether or not a muffler affects gas mileage.

RELATED ARTICLE: Muffler Delete & Gas Mileage (Everything You Need To Know)

Does a Muffler Add Horsepower?

Car’s mufflers can slightly increase horsepower by reducing back pressure. 

This happens because the exhaust gases are able to flow more freely through the muffler and out of the car. However, there are many other factors that affect horsepower, such as engine size and tuning, so it is difficult to say how much of an impact a muffler actually has.

Do not expect a significant increase in horsepower, but a better quality muffler can improve the efficiency of the engine, which can lead to a very slight improvement in horsepower. 

RELATED ARTICLE: Muffler Delete Vs Straight Pipe: Horsepower, Mileage & Damages

Will a Muffler Delete Void Your Warranty?

Usually, a muffler delete will not void your warranty as long as the rest of the vehicle remains unmodified. 


With the Magnuson-Moss Warranty act, a muffler delete will not void the warranty of your car. For dealers to void your warranty, they must prove that the problem is directly caused by your modification. For example, if you perform a muffler delete and soon after your headlight stops working, then the warranty for the light still applies. But if you perform a poor muffler delete that causes your exhaust to break from rusting, then the warranty for your exhaust pipe won’t apply.

The main reason for this is that the muffler delete does not significantly alter the performance of the vehicle or affect its emissions. However, if other modifications are made to the vehicle in addition to the muffler delete, then this could void the warranty.

Which muffler is your car right now?

READ MORE: Does Muffler Delete Void Warranty? 

How Long Does a Muffler Delete Take?

A muffler delete is a relatively simple process that can be completed in a matter of minutes. However, the exact time it takes will vary depending on the specific vehicle. 

In general, the process involves removing the muffler and exhaust pipes from the vehicle and then installing new pipes in their place. This can be done quickly and easily with just a few tools.

Where to Get a Muffler Delete?

You can go to a local exhaust shop and they can do it for you. Or, you can buy a kit online and do it yourself. 

Either way, you’ll need to remove the old muffler and replace it with the new one. Performance shops typically charge more than ordering online.

Performance shops usually offer high-quality products, but you will pay more for them.

Can You Do a Muffler Delete Yourself?

You can do a muffler delete yourself, with the right tools and equipment. Majority of people opt to have a professional do the work.

A muffler delete is when you remove the muffler from the exhaust system of a vehicle, which results in a louder and more aggressive sound. 

This can be done yourself, but it is important to know that it may void the warranty on your vehicle if done improperly. 

Resonator Delete vs Muffler Delete

A muffler delete will usually be louder than a resonator delete.

The main difference between the two is that a resonator delete only removes the resonator, while a muffler delete removes the entire muffler. Both types of deletes will make your car louder.

The debate between those who advocate for a resonator delete and those who advocate for a muffler delete is one that has been raging for years. Some say that a resonator delete is all that is necessary to achieve the desired results, while others argue that a muffler delete is the only way to go. So, which is it?

Well, it turns out that there is no definitive answer. It really depends on what you are trying to achieve. 


Is Muffler Delete Loud?

Muffler delete is a popular aftermarket modification that involves removing the muffler from the exhaust system. This results in a louder exhaust note, as there is no longer any muffler to dampen the sound. 

Some people enjoy the increased noise, while others find it excessive and unpleasant and annoying. Whether or not muffler delete is loud depends on the person’s opinion.

Can No Muffler Cause Misfire?

The exhaust gases are also hotter without a muffler, which could potentially lead to engine knock. Knocking can cause misfire.

There are also few potential reasons why a car might misfire when the muffler is removed. 

One possibility is that the exhaust gases are not being properly vented, and so they are coming back into the engine and causing the misfire. Another possibility is that the engine is not getting enough air, and so it is running lean and misfiring.

Is a Muffler Delete a Straight Pipe?

No, a muffler delete is not a straight pipe. 

A straight pipe is a type of exhaust system that doesn’t have any baffles or chambers, which means that it can be very loud. 

A muffler delete is simply an exhaust system without a muffler. This means that it will be quieter than a straight pipe, but still louder than an exhaust system with a muffler.

RELATED ARTICLE: Straight Pipe Vs Downpipe; Louder, Horsepower, and Engine Impact

Why Would Someone Remove a Muffler?

There are a few reasons someone might remove a muffler from their vehicle. 

One reason could be to increase the engine noise, giving the car a louder, more aggressive sound. Another reason could be to improve engine performance by allowing exhaust gases to exit more freely. 

Additionally, removing the muffler may make the car lighter, which can also lead to improved performance. 

Finally, some people simply prefer the look of a car without a muffler.

What Is a Mid Muffler Delete?

A mid muffler delete is a performance upgrade that involves removing the muffler from the exhaust system, typically in the middle of the vehicle. 

This results in a louder exhaust note and increased airflow, both of which can improve performance. In some cases, it may also be necessary to modify or remove other components of the exhaust system in order to accommodate the new configuration.

Do consider before performing a mid muffler delete, such as whether or not your vehicle will pass emissions testing, as this modification can affect emissions levels.

Should I Delete Muffler or Resonator?

While both will give your car a louder exhaust note, the muffler delete is generally more aggressive sounding, while the resonator delete will provide a deeper tone. 

Ultimately, the decision comes down to personal preference and what you are looking to achieve with your car’s sound.

If you are looking to improve the sound of your car, you may be wondering whether to delete the muffler or resonator. If you are looking to improve the performance of your vehicle, then you should delete the muffler. 

The muffler is there to muffle the noise of the engine, and it does so by reducing the exhaust flow. By deleting the muffler, you will increase the exhaust flow and improve the performance of your engine. However, you should also consider deleting the resonator as well.

RELATED ARTICLE: Muffler Delete Vs Resonator Delete: Sound, Power & Cost

Will Muffler Delete Affect Emission Test?

Muffler delete will not impact your smog inspection. Muffler is purely a sound suppressing device – so removing it will not change your emission at all.

While you perform a muffler delete, it’s important to make sure that the catalytic converter (CAT) is not touched. CAT takes the major role in keeping your car emission in check. If the CAT is somehow broken, you will surely fail your smog inspection.

RELATED ARTICLE: Muffler Vs Catalytic Converter: Differences, Horsepower & Cost

What Is a CAT Delete?

A “CAT delete” is the removal of a catalytic converter from a vehicle’s exhaust system. 

This is often done to improve the vehicle’s performance, as the catalytic converter can act as a restrictive element in the exhaust system. Removing the catalytic converter can increase horsepower because it reduces backpressure – allowing your car to expel more exhaust gases and providing more room for air to enter the combustion chamber and create bigger combustion.

Chai WJ.

Chai WJ.

I am a car enthusiast and a passionate rider who loves to discover new places. Since the pandemic, I can't go to places and I started to blog and share information that I learned. I'm not easily distracted, I just... OMG, do I hear a Supra?

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