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Originally Posted by SVXRide
Harvey,
Gid'ay back at you!
Wouldn't the reflected wave energy coming back out of a "two in" be a function of the internal design of the Cat? I agree with your "two in" vs "Y" in comment.
-Bill
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IIRC, a Y-pipe will propigate a sound wave out both branches opposite the input, regardless of the shape of the Y. Where as a "2-in" resinator or cat won't as long as the internal volume of the resinator/cat is significantly larger than the pipes leading into it.
When there's a decent sized volume change from the pipe to the resinator, there's a pressure drop. It's this pressure drop that will prevent the sound wave from one pipe traveling back out the other pipe. Essentially, it's the location of the resinator that determines the "tuned length" of the exhaust.
Someone correct me if I'm wrong, I'm new to this topic!