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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > 335i muffler in detail



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      04-13-2009, 10:18 PM   #23
SoCalTech
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Quote:
Originally Posted by jadeddjay View Post
the exhaust flap closes to heat it up and opens when youre on throttle.
The only thing the flap does is quiet down the exhaust due to European noise regulations. Has nothing to do with emissions.
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      11-08-2012, 12:09 AM   #24
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Just saw date lol ignore this.
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      11-08-2012, 10:15 AM   #25
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Originally Posted by Beemw335 View Post
Just saw date lol ignore this.
Bringing back an oldie. Good info here tho have had it book marked for awhile now.
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      12-05-2013, 12:18 AM   #26
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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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