Thread: BMW PE
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      02-22-2013, 12:50 AM   #9
JDane07
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Drives: 330i (sold), MK7 GTI
Join Date: Nov 2011
Location: Napa, CA

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There's definitely a break-in period. About the time you throw in some catless headers you should hear a very sharp amplification in sound





But no, there really isn't a break-in imo.
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