Oem exhaust question

Macho Torque · 05-15-2009, 07:01 PM

ok today i decided to delete my mufflers of my e90 335 i alreayd have my resonator deleted also, for those familiar there is a flap in the end of the left exhaust so i unwelded then rewelded the flap connected it, when i started driving and the rpms jumped engine malfunction and into limp mode, the flap started shutting, my diagnosis is that the flap wud shut and send the air back thru the exhaust in the motor compared to when there was a muffler it redirected it to the other muffler i wound up cutting the flap and straight pipe the back, heres the question do i need the flap and what is it rele for?

Bimmer335i07 · 05-15-2009, 07:33 PM

Quote:

Originally Posted by Macho Torque

ok today i decided to delete my mufflers of my e90 335 i alreayd have my resonator deleted also, for those familiar there is a flap in the end of the left exhaust so i unwelded then rewelded the flap connected it, when i started driving and the rpms jumped engine malfunction and into limp mode, the flap started shutting, my diagnosis is that the flap wud shut and send the air back thru the exhaust in the motor compared to when there was a muffler it redirected it to the other muffler i wound up cutting the flap and straight pipe the back, heres the question do i need the flap and what is it rele for?

You don't need it at all. You should have just plugged the hose and that would have been all you needed to do.

I'm not sure what it does, but if you

for the golf tee mod, it will be explained in there.

skitlz · 05-16-2009, 01:10 PM

U dont need the flap. Its there to reduce the sound of the exhaust for lower rpms. It then opens up at high rpms. Also heard its for warming up the cats faster upon initial startup. Most people just unplug the solenoid in the drivers side tailight area, or plug/zip tie the hose.

DANMACINSD · 05-16-2009, 01:16 PM

I definately think it has something to do with warm up only. Mine is disconnected, plugged and stuck underneath somewhere. Haven't used it in over a year.

Sniz · 05-16-2009, 04:52 PM

holy crap....use periods next time please.

you dont need the flap.

05-15-2009, 07:01 PM	#1
Macho Torque Private 2 Rep 50 Posts Drives: Black/Black E90 335i... Join Date: Apr 2009 Location: New York iTrader: (0)	Oem exhaust question ok today i decided to delete my mufflers of my e90 335 i alreayd have my resonator deleted also, for those familiar there is a flap in the end of the left exhaust so i unwelded then rewelded the flap connected it, when i started driving and the rpms jumped engine malfunction and into limp mode, the flap started shutting, my diagnosis is that the flap wud shut and send the air back thru the exhaust in the motor compared to when there was a muffler it redirected it to the other muffler i wound up cutting the flap and straight pipe the back, heres the question do i need the flap and what is it rele for?
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05-16-2009, 01:10 PM	#3
skitlz Private First Class 7 Rep 183 Posts Drives: e92 335i Join Date: Sep 2008 Location: Sac iTrader: (0)	U dont need the flap. Its there to reduce the sound of the exhaust for lower rpms. It then opens up at high rpms. Also heard its for warming up the cats faster upon initial startup. Most people just unplug the solenoid in the drivers side tailight area, or plug/zip tie the hose.
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05-16-2009, 01:16 PM	#4
DANMACINSD First Lieutenant 46 Rep 324 Posts Drives: 2013 BMW 535i Join Date: Nov 2007 Location: SAN DIEGO iTrader: (1)	I definately think it has something to do with warm up only. Mine is disconnected, plugged and stuck underneath somewhere. Haven't used it in over a year. __________________ 13 535i Msport
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05-16-2009, 04:52 PM	#5
Sniz Lieutenant General 654 Rep 10,587 Posts Drives: e92 335 - gone // e36 M3 turbo Join Date: Mar 2007 Location: Ellicott City, MD iTrader: (1)	holy crap....use periods next time please. you dont need the flap. __________________
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