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      04-13-2009, 11:42 AM   #16
jadeddjay
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Drives: e92 335i
Join Date: Oct 2005
Location: jackson, ms

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2007 e92 335i  [0.00]
i think what you said is a resonator is actually just a Y pipe. if you found catalytic material in the drivers side muffler, chances are, its a cat. the exhaust flap closes to heat it up and opens when youre on throttle.

upstream to the Y pipe are the secondary cats and the primary cats are in the downpipe upstream to that.