Does a Muffler Delete Add Horsepower? – What Really Happens

does a muffler delete add horsepower

People who love vehicles, especially cars, concern about the engine’s sound as well as its powerfulness. So, many car lovers might remove the muffler when they modify it. Of course, the question we have is, “Does a muffler delete add horsepower?”

Today we are going to talk about it. So, Get ready to have a detailed conversation about something very important!

First, we need to know about the muffler. What is the function of it? After getting a basic understanding of the muffler, we can have a better discussion very easily. Okay, let’s see first what a muffler is.

What is a Muffler?

The muffler is an essential part of the exhaust system to reduce the excessive noise generated during the internal combustion process of a vehicle. The loud noise created as a byproduct of the enormous power produced by the engines reverberates through the exhaust valve. The noise emitted for one minute is too loud to take. Without a muffler, this loud noise comes out.

When it comes to the process inside a muffler, this is what it is. The tubes, baffles, and chambers contained within a muffler reflect the loud sound waves produced by the engine. A muffler is designed to produce a wide range of sounds. Thus, some are very silent, but some are very loud.

Does a Muffler Delete Add Horsepower?

This is a bit ambiguous. Let’s explain a little. Does deleting the muffler result in a significant horsepower increase? If so, how will it happen? Let’s get these problems clear.

This mostly applies to older cars and cars with a higher RPM range. For example, removing the muffler on an old car increases exhaust and reduces damage to engine back pressure. This results in higher horsepower at higher speeds. That’s why many older cars delete the muffler. Deleting a muffler gives the engine between 5 and 10 horsepower.

However, this is an imprecise figure. The horsepower increase is determined by the exhaust pipe design and how restrictive the muffler is. In most cases, the horsepower increase may only be between 1-3. It’s one where the horsepower increase isn’t nearly enough for us to feel.

How Does Engine Horsepower Increase after Deleting a Muffler?

We need to determine how the engine’s horsepower increases after deleting a muffler. What is the process?

A muffler is a bit heavy. Therefore, reaching the vehicle’s maximum performance is a little challenging. In short, when the vehicle’s weight decreases, the performance increases. This is what removing the muffler does.

Okay, let’s see how this statement works in detail.

  •   Improving Vehicle Performance

Now you know the process of fuel combustion and the process of an engine in general. On the other hand, we briefly discussed the muffler’s function and its responsibility. Increasing the performance of a vehicle is a powerful factor in increasing the horsepower of the vehicle. Let’s see how the muffler can increase the performance of the vehicle.

It is straightforward to understand. A massive amount of air comes from the vehicle engine through the exhaust. By removing the muffler, the gasses are released at a faster rate. Then the power stroke process of the engine happens very fast. Accordingly, this procedure helps to improve the performance of your vehicle.

  •   Reduce Back Pressure

What emerges when talking about this is that increasing performance directly affects the increase of a certain amount of horsepower. Let’s first see what the back pressure of this engine is.

Let’s look for a definition for back pressure. We can define it as the applied pressure that can be taken to overcome the system’s hydraulic resistance before releasing the pollutant gases into the atmosphere.

Let’s assume the muffler is removed, the air resistance is lost, and the gases escape quickly. Likewise, the back pressure lost by removing the muffler means the engine does not have to work as hard. Let it start working easily and quickly.

Does a Muffler Delete Affect Gas Mileage?

Now you may have another problem regarding the gas mileage. As we discussed earlier, the muffler stops the engine noise and deals with the toxic fumes. But a muffler is never directly involved in the combustion process. So deleting the muffler will never affect fuel mileage.

Will Cutting Off the Muffler Hurt the Engine?

Many people have different ideas. So, removing the muffler is a bit controversial topic. Consequently, many people think twice before going for this midification. The fuel-related issue mentioned earlier and the issue with this engine are similar.

You know what a muffler does. As you and I know, the main function of the muffler is to prevent the excessive noise that comes with the exhaust gas of the engine. It does not interact with any other functions or systems. So you have no problem! Removing the muffler will not harm your engine at all.

And you should remember one little thing. Although removing the muffler will not harm your engine or fuel, it will cause some environmental problems. For example, excessive noise and gases can cause some pollution of the surrounding environment. At the same time, the neighbors face some difficulties due to the noise. So keep this in mind when removing a muffler.


Does a muffler delete add horsepower? Nothing to worry about. We solved our huge problem successfully. We hope the article would be helpful to clarify your all doubts! If we review what we have discussed, we have gained a clear understanding of the function of a muffler and the process. After that, we moved on to the main topic. We discussed the problem in detail.

If we focus again on our main topic, the most straightforward answer is “yes.” There will be some increase in horsepower. But it is relative. Depending on the external factors affecting it, there may be some kind of change. Likewise, remember that if you don’t gain at least ten horsepower after deleting a muffler, it’s too small for us to notice. 

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