Thread: X-pipe fun
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      01-14-2013, 12:50 PM   #22
Brosef's Avatar
Drives: 2011 M
Join Date: Aug 2009
Location: Chicago

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the Challenge sport pipe (with HFC's) is a good way to go. it will undoubtedly make the car noticeably louder though, as will any x-pipe that does away with primariy cats.
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