biggie wrote:Basically: The more restrictive the more quiet. But the more restrictive the less power gains.
Well... sorta. It has to do with sound waves (physics) and its relation to the path it travels (in this case the pipe). Like the pipes in a pipe organ. Bigger pipe produces a louder, lower octave, sound; greater amplitude with lower frequences. Smaller diameter pipes produce a quieter, higher pitched, sound; lower amplitude and higher frequency. If you remove the muffler and resonator (which is really just another muffler) then, yes, more restrictive = less loud. With the right combination of mufflers and resonators, it is possible to have low restriction and mellow exhaust note. To my knowledge there isn't a system in the aftermarket that does this because, quite simply, people associate the sound with performance. And, since sound is more noticeable than actual gained HP, systems that can be heard sells!