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      10-10-2012, 01:31 PM   #11
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Drives: 2008 335i + 2014 X5
Join Date: Dec 2011
Location: DFW, Texas

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2008 BMW 335i  [4.38]
Originally Posted by 5soko
What your hearing is the exhaust flap closing and opening. Your sounds to be a little extra loose.

What you can do to cure this problem is the 'golf tee mod'.. This will disable the valve from opening and closing. I have disabled my valve since i bought my car, i pinched the black wire that goes to the actuator on top of the exhaust tip that was in the video, and zip tied it. This stops air going to the actuator, hence stopping the closing/opening action.

Or tell the dealer that your valve for the exhaust is bad and see if they will warranty it, problem not.
My car sounds exactly like this at startup and that's what I always assumed it was, too.

I have thought about having it looked at at one of my maintenance services but I have a modified exhaust so I figured they would just blame it on that

It sounds like a chain rattling.

2008 E90 335i // Black Everything // photos
COBB tuned / QTP e-cutouts / Helix FMIC / cp-e DCI / AWE BOVs / Catless / FBO + F15 X5 xDrive35i