Had a problem you could say.
I had this portion on my car already open cause I was working on the stereo. I saw this post and thought, "I know that part. I'll do this!"
Did it, sounded nice, drove, literally, 1/4 mile and it backfired/misfired, check engine light came on, and the car no longer had boost. I got out, put the sensor back, still no boost, AND when I'd start the car the RPMs would drop and almost stall, then jump back up.
Took it to a mechanic (BMW could get me in for a full week), he said the vacuum tube for the boost popped out and broke, and that the exhaust flap is just a coincidence.
Regardless, I'm terrified to do this again.
TL;DR
Had engine problems right after doing this mod, mechanic says it's a coincidence.
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