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01-23-2013, 02:50 PM
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#15
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First Lieutenant 
Drives: E90 335 M-Sport
Join Date: Feb 2012
Location: tampa
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Same issue here more noticeable on cold start to warm transition when the waste gate changes state.
Sounds like a valve tap or lifters. Dealer said normal but it started at about 26k miles. Under load its quite.
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