Mostly people believe that your exhaust, or muffler as it is more commonly known as, is to quieten the car. This is true and it has other main functions.
Did you know that your exhaust system is a major cooling component? Your engines cooling can be up to 35% through the exhaust. Other factors are converting Carbon Monoxide gas to Carbon Dioxide, moving toxic gases past all entry points to the vehicle, and even fuel control via exhaust gas sensors in the modern day car.
There is more to your exhaust than just a pipe!