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      01-29-2011, 12:36 AM   #4
Drives: 2008 135i 6MT
Join Date: Jul 2010
Location: Bury St Edmunds UK

Posts: 1,165
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2008 135i  [3.00]
Hmmm never heard that sound before from any N54. If I had to guess since it seems to be coming from the exhaust side is maybe a pinched or leaking vacuum line leading to the solenoid for the wastegates since that was what you were pointing to. Just my guess.
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