Thread: Stock sound of N55
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      07-26-2015, 06:19 PM   #4
Vigilante375
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Drives: 2012 AW 6M 135i
Join Date: Sep 2011
Location: WA

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Maybe it did have a aftermarket air filter or bmw performance software installed. There is no difference in sound for N55 equipped 1er's, if they are completely stock and equipped the same.
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