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Old 05-27-2012, 05:14 PM   #3
DDNPresident
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Join Date: Dec 2011
Location: Miami
Posts: 126
My Ride: 2004 325i (E46)
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Vacuum leak if I had to take a guess. Happened to me once when I put on a new lower intake boot and it slipped off a bit. Only time I ever heard a sound like that. I could be wrong but I would check where a MAJOR vac leak could happen.
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