Will replacing my muffer with a performance muffler reduce my mpg? What are the cons if I do it?

Question

I would like to know more information about this subject so I could decide if I can go ahead and replace the original muffler on my new car or to just leave it as is.

Answer 1

its going to depend a lot on the type car you drive,most of the time it will help one to a certain extent,if you add to much muffler you can cut down on performance on some engines,but in most cases it will help one a small amount,you didn't say what type car you have so all i can do is speculate on this one,good luck.

Answer 2

Many factory warranties are voided by modifications to the exhaust system, suspension system.

Check with your Dealership and see which are approved by the Factory First before spending the money for the little extra horsepower and Noise. and or fuel economy.

Answer 3

  You are reducing back pressure which will give you a little gain in mpg. But you might push the torque range higher giving you the impression that you lost power. I have installed mufflers on cars and had the owners come back and complian that something was wrong. On the other hand the car is louder and that gives you the impression that your going faster than you are. The pros are better mpg (marginal), more horsepower, louder more agressive sound than stock. The cons are louder exhaust sound (attracts more attention sometimes from cops) the torque range pushed up higher.

Answer 4

Lately, researching cars with best gas mileage is the intelligent approach to saving money and the environment. With gas prices being where they are, the more miles per gallon that can be obtained for a car can make a huge difference. This can cut trips to the gas station in half, or sometimes even more.

For an example, if gas were at an average price of $3/gallon, and over a year 12,000 miles were placed on a vehicle:

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