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      08-27-2010, 05:45 PM   #7
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Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

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Originally Posted by Bob MG View Post
I think all the guys that are S/C with catless X Pipes are reporting around 20whp gain without cats
without the 100 cpi akra cats? I doubt 20hp from those. Maybe a couple. I can see 20 over other HFC's or OEM cats. But maybe, would be interesting to see
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