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      01-07-2012, 08:57 AM   #1
Stronghammer's Avatar

Drives: E92 M3
Join Date: May 2011
Location: south carolina

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Need advice

I have the subject.
Currently I am running stock tune, stock x pipe and innotech axle back.

I am planning on deleting my primary cats and having a local shop build me a X-pipe with high flow cats and probably resonators. I know it will likely result in CEL and I am willing to do tune or get Delete R module.

Here is where I need advice. My local guy has suggested adding a set of cut outs to my system BEFORE the high flow cats. More specifically a few feet off the headers. I know this would be very loud but my concerns are 1. Am I setting my self up for problems having the exhaust come out in that location ? It must be really hot. 2. How would a tune handle this scenario ? If the tune was designed for the x-pipe with cut outs closed what happens when I open the cut outs ? Seems to me the exhaust flow is radically different in these two situations.

Should I suggest we put the cut outs down steam of the high flow cats ?

I know there are other options out there but this is the one I am considering at the moment.
2011 E92 M3 MR July 11 ED Sept 11 PCD
Mods: ESS VT1, MS test pipes, 19 BBS CH-R, Eibach pro springs, Painted reflectors, carbon fiber grills, Painted side markers with dark tinted lenses, 30% tint, Arkym rear diffuser, Innotech axle back exhaust, Performance spoiler
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      01-07-2012, 03:37 PM   #2
IMG's Avatar

Drives: E36 M3 Track car,Ess E90 M3 DD
Join Date: Feb 2008
Location: Location

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Originally Posted by SehrSchnell View Post
Why don't you get an aftermarket x-pipe? Challenge, Dinan, or Fabspeed? IMHO, instead of doing HFC you might as well go cat-less, in both cases you'll need a tune to deal with the CEL.

Yes, cut-outs are loud as f@ck... you'll be loud enough with an x-pipe. I think for all the money you'd spend on cut-outs and modifying your existing system you should buy the x-pipe.
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