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manny127 07-01-2009 08:41 PM

335i Exhaust Issue
Hey, i have just picked up my 09 335i a few days ago and have a weird issue, and am unsure of whether this is a problem or normal. So just yesterday i had the car running in the rain, and i noticed that there was only smoke coming out of one exhaust. I got closer, put my hand up to it, and noticed that the left side exhaust was not blowing air at all. After a while however that exhaust started blowing air. I checked this again this morning, and noticed that once again only the left exhaust pipe was working. Correct me if i am wrong, but i thought that one muffler is dedicated to the first three cylinders, and the other pipe is dedicated to the other, straight from the engine, through the turbos, and to the tail of the car. ANy ideas of what is happening??

Stephanie 07-02-2009 12:35 PM

...Not a problem at all!!

The driver side exhaust has a little flap that runs off an actuator that opens/closes at different RPMs and typically stays closed at idle to increase back pressure/let allow for the cats to heat up/etc...

I actually disconnected this flap (it always stays open now)... The mod is called "Golf Tee Mod" where you disconnect the vacuum hose from the actuator and plug the hose with a golf tee (I'm not kidding) and cover the exposed inlet on the actuator with a vacuum cap ($0.62 at Part Source)

The actuator is located to the left of the driver side muffler... Lay down on the floor and look up, you can't miss it! Looks like a wastegate.


This doesn't effect the car in an adverse way whatsoever and will not throw a code on the ECU (so the dealer will never know)... It WILL however give you a slight, sexy change in tone of your exhaust (a little bit deeper and meaner)

For 62 cents and for less than 5 mins of work, why the hell not!
And you can always reverse the change in a few seconds, too!

Stephanie 07-02-2009 12:39 PM

Oh... And how rude of me!

Congrats on the new car, you'll absolutely LOVE it! is also a great site if you need a hand with anything (mods, questions, etc.) ... Everyone is great on there!

Otherwise, let me know if you need a hand with anything!

- Steph

manny127 07-02-2009 03:50 PM

Thanks for the help, and the tip. =) Ive only driven the car for a few days and i am already loving it. (Although i cant really push the car yet since i am still breaking in)

Stephanie 07-08-2009 09:49 AM

^^ Anytime :)

ctgazer 07-28-2009 11:49 AM

wow steph..just full of info!

yea, and the golf tee mod is schweet. add some tips and everyone will be thinking you have an aftermarket exhaust :D

whoami 07-28-2009 12:55 PM


time to do the golf tee mod :P

DINO K 08-08-2009 06:54 PM

electronic dump ;)

darin911 10-15-2009 08:30 PM

golf tee MOD hehee

ChrisTO 10-15-2009 11:27 PM

/insert your own joke here/



Originally Posted by Stephanie (Post 1320421)
Otherwise, let me know if you need a hand with anything!

- Steph

Stephanie 10-16-2009 08:51 AM


Originally Posted by ChrisTO (Post 1355968)
/insert your own joke here/


I walked right into that one... *sigh*

LOL... "that's what she said" moment? I think yes. :P

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