Discussion in '3 Series' started by zxrichie, Dec 18, 2018.
is this an exhaust flap? the bit sticking out that is...
That there thing on the left is the vacuum controlled flap
Ordinarily a single pipe is used, supposedly to reduce / suppress noise when idling
When the throttle is depressed a vacuum is built and flap opens
Many discard as it’s troublesome as fitted in the splash zone & seizes up
(I believe that’s how it works)
Cheers, Thanks for that