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      02-13-2013, 10:58 PM   #2
llis
octane chick
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Drives: Ms
Join Date: Oct 2010
Location: Colorado

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Garage List
2013 BMW M3 ZCP  [5.00]
2003 BMW M5  [0.00]
Look at the diffuser thread http://www.m3post.com/forums/showthread.php?t=792651 ... Most of those cars have non-OEM exhausts, and should give you an idea of what you're facing. Searching that same forum might also yield an answer for you.
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2013 E92 ///M3 ZCP 6MT Speed Yellow 2003 E39 ///M5