Quote:
Originally Posted by Cfrem15
On my 335i the right exhaust flap was closed till about 3000 rpm. The golf tee mod opens both of them up so it is a bit louder. There was 2 ways to do it. Either unhook it from the trunk or go under the car and plug the hose... Just watched a video on a 135i, so it should work on our x1
http://m.youtube.com/#/watch?v=19pq3...%3D19pq3nk8bRc
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I've removed mine. Cut the arm (that opens the flat) and removed the ECV unit. It does sound a lot deeper now, I was somewhat surprised.