This may be one of the fastest updates ever, but, have your checked your DISA? I've been pulling parts and inspecting them all week. After making my post I was able to pull the air box, then DISA and sure enough, it's broken!! The flap moves freely and should not move at all without the computer controlling it. I'm going to the dealer tomorrow morning first thing to get the part. I'm hoping this eliminated it once an for all, but, looking at the evidence here it should.

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2008 X5 3.0si
256k Strong