335i muffler in detail

SoCalTech · 04-13-2009, 11:18 PM

Quote:

Originally Posted by jadeddjay

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.

Beemw335 · 11-08-2012, 12:09 AM

Just saw date lol ignore this.

e92oholic · 11-08-2012, 10:15 AM

Quote:

Originally Posted by Beemw335

Just saw date lol ignore this.

Bringing back an oldie. Good info here tho have had it book marked for awhile now.

pocoyo_3 · 12-05-2013, 12:18 AM

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.

11-08-2012, 12:09 AM	#24
Beemw335 Colonel 62 Rep 2,013 Posts Drives: 335i Join Date: Mar 2011 Location: My car is my home iTrader: (2)	Just saw date lol ignore this.
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12-05-2013, 12:18 AM	#26
pocoyo_3 First Lieutenant 52 Rep 352 Posts Drives: 2006 330i / 6MT Join Date: Apr 2010 Location: San Diego iTrader: (0)	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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