Thread: Injen Intake Question
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      04-23-2012, 11:15 AM   #6
Juiced46
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Drives: 03 Turbo Cobra, 2011 335xi
Join Date: Jun 2010
Location: Wallingford CT

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Thats what a turbo sounds like when it is spooling up, its louder now because of the open air filter under the hood. Completely normal.
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