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      04-05-2010, 11:34 AM   #1
Fen335i
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Drives: e92 M3 / X5d / Z4 M Roadster
Join Date: Jun 2008
Location: Pacific Northwest

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HFC & xpipe question

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?