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quoted from www.howstuffworks.com :
A chamber called a resonator is connected to the first chamber by a hole. The resonator contains a specific volume of air and has a specific length that is calculated to produce a wave that cancels out a certain frequency of sound. How does this happen? When a wave hits the hole, part of it continues into the chamber and part of it is reflected. The wave travels through the chamber, hits the back wall of the muffler and bounces back out of the hole. The length of this chamber is calculated so that this wave leaves the resonator chamber just after the next wave reflects off the outside of the chamber. Ideally, the high-pressure part of the wave that came from the chamber will line up with the low-pressure part of the wave that was reflected off the outside of the chamber wall, and the two waves will cancel each other out.
http://static.howstuffworks.com/gif/muffler-cutopen.jpg
http://www.howstuffworks.com/muffler3.htm
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you can have a seperate "chamber" thats purely a resonator to help dampen the sound which is sererate from the muffler.... usually found like someone said.. maybe Jim?? before the muffler in many applications....
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there are a few variations of mufflers though.
My muffler has no chamber and is pretty quiet compared to some of the ones I hear.
the inside has a upper and lower wave of perforated metal sheets.
the waves run parralel between the layers and tapers off to a flat curve towards the center and as the wave moves out along the outer wall of the muffler it gets larger.
a pretty slick design. Free flowing cause there is no actual wall or chamber sort of like a straight through bullet style muffler, and it still gives a nice exhaust note... too soft for me even after the 2.5" went on... so I'm getting an N1 after the A20's fixed.
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oohh N1 ...... yummy.... post some pics.....
