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      02-05-2013, 11:45 PM   #14
flipm3
E46 + E90
 
Drives: E46 M3 + E90 M3
Join Date: Jul 2008
Location: Illinois

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2009 BMW M3  [0.00]
2002 BMW M3  [0.00]
Quote:
Originally Posted by dmk08 View Post
Awesome. Does anyone know if there is any drastic HP difference in a tune + high flow cat x-pipe vs tune + no cat x-pipe?

Thanks.
By deleting the secondary cats, I'd imagine the gains to be rather minimal on an XPipe that already deletes primary cats. If ever it might make the car smell a minute amount more, increased volume, increase rasp, and possibly eek out a few more ponies.

Quote:
Originally Posted by PhoenixRising View Post
I think a lot of the 2-cat systems are too loud for my taste. I'd like to modify the sound similar to the BMW performance exhaust.
I think the biggest determining factor would be the muffler. I think there are exhaust setups out there that sound very clean, classy, and quiet with primary cat deletes. Akrapovic, Evolve Automotive, and Supersprint are the three that come to mind that are all high-end top quality systems, but in no way do they sound harsh or overly aggressive.
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