Thread: stock exhaust mod
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      05-05-2012, 03:18 AM   #6
tibra1
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Drives: 2011 ZCP M3 - 2007 335i crashd
Join Date: Apr 2009
Location: NYC

iTrader: (4)
No power gains..purely sound ..best $400 I have spent on the car..I have #1

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1. Replaced 2 Long perforated pipes w/ straight pipes

2. Replaced all 4 perforated pipes with straight pipes
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