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      12-04-2013, 11:18 PM   #26
pocoyo_3
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Drives: 2006 330i / 6MT
Join Date: Apr 2010
Location: San Diego

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marconi118 is right. The drivers side has a smaller resonator which is within the chamber. The passenger side has the larger resonator, which I suspect is better at attenuating low frequency drone than the drivers side. That's why the exhaust system has the flap on the drivers side to redirect the exhaust flow to the passenger side.
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