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      02-05-2013, 12:24 PM   #2
Dave07997S
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Drives: 2013 BMW M3 ZCP Coupe
Join Date: May 2009
Location: El Segundo, CA

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Quote:
Originally Posted by mkiv808 View Post
Is it feasible to add 2 resonators and 2 HFC's to an x-pipe that has neither?

I do not like the raspy sound of a resonator-less x-pipe, and my car is still under warranty and I'd rather not bring up a CEL and want to be emissions compliant.

What would I need from a HFC standpoint to keep it compliant?
First off even adding a set of HFC in the primary position may still give you a CEL. Something along the Fabspeed setup can work with 02 extenders but even then its a crap shoot if you get a CEL or not. Problem with adding HFC in the primary position is that they still will hang below the bottom of the car and scrape on bad speedbumps, etc. Adding resonators is no issue. I did this with a Riss Racing Xpipe I had (sold it, similar to the Fapspeed setup and it rubbed on speedbumps and such) and it removed most of the rasp.

If you really want to be emission compliant put the stock xpipe back on...
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2013 M3 Coupe-MR/BLK ZCP, ACM test pipes, BPM Stg2 dev. tune and Megan catback, AFE Stg2. with C/F elbow VMRV810 19x10&19X11 275/295 Mich PSS.
Previous rides: 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk