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      04-05-2010, 11:37 AM   #2
J08M3
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Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

Posts: 6,012
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Quote:
Originally Posted by Fen335i View Post
Hey Folks -

Has anyone just done a HFC install and left the OEM x-pipe on the car? I understand this might involve some cutting and fitting to get new HFC's onto the stock system, but curious if anyone has done this and know what the perf gains are. From what I've read the OEM xpipe is a fairly good design...the main issue is with the restrictive OEM primary cats. Is this simply not possible?
It would probably be cheaper to just buy and xpipe section that has nice smooth bends rather than the crushed OEM ones. The labor to cut and install HFC's to this xpipe would be a wast of time.
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