E46Fanatics - View Single Post - I feel stupid...exhaust question
View Single Post
Old 02-21-2009, 01:04 PM   #4
Registered User
Join Date: Oct 2008
Location: Portland, OR
Posts: 121
My Ride: '03 325xi
Originally Posted by TxZHP04 View Post
No need to go to the dealer to get laughed at, we can take care of that for you right here for free.

Your muffler should have a vacuum actuated butterfly valve that blocks the exhaust on one side at idle. It opens up under acceleration, or when the car is off. Many people block off the vacuum line so that the valve remains open at all times. Search "golf tee mod" for hundreds of threads on the subject.
I appreciate your "easy" reply! I noticed this last night, and had a chance to take a better look today. I noticed what you said above. Guess I need to spend more time with my car. Again, thanks for your help!
New_2_BMW is offline   Reply With Quote