A muffler is designed to reduce the sound produced when the fumes from the engine are expelled at high pressure. This is accomplished through various processes the basic being production of waves that cancel each other out to produce no sound at all. If you want the best in the market, those that have the least internal deformation such as those that have mandrel bent tubing are what you should be looking for. Magnaflow is probably the best option iv seen around.
July, 10, 2012 AT 8:23 AM
Exhaust noise is actually the hot gasses expanding, a muffler slows the gas flow and also cools it as well, a good muffler has pipes and baffles that change the direction of the gas flow and it allows it to expand with in the muffler as well, that is why they are bulky, so basically they slow and cool the exhaust gas flow.
July, 10, 2012 AT 8:25 AM
Imagine talking with another person face to face. Now imagine that other person in another room, in a closet, with the door mostly closed. Carrying on a conversation would be harder because you wouldn't be able to hear 'em.
The exhaust pulses from an engine start out really loud but the shock waves go through one third of the muffler, through a small opening into another room, to the other end of that room, then through another opening into a third room, to the other end of that room, then out the tail pipe. That's like sitting in a closet in your house and trying to talk with someone standing outside, ... In the garage, ... With the doors closed.