From what I have seen, mainly one tailpipe is used, but under very hard acceleration, both tailpipes will "open". I have always found this so strange with modern BMWs!
Quote:
Originally Posted by Bimmervegas
If the 40e is anything like the exhaust on my 16 35i xDrive, only exhaust comes from the driver's side tailpipe - the other opening is simply faux.
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