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      04-07-2019, 11:47 AM   #10
wakebrdr1
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Drives: '09 E92 M3
Join Date: May 2017
Location: Columbus, OH

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Quote:
Originally Posted by eatsleepboost View Post
A tune is not necessary when modifing an exhaust.

Removing the cats will give you more power but also a check engine light and more smell from the exhaust. The stock xpipe has 2 primary and 2 secondary cats that you would be removing. There are many xpipe options that have 2 or 4 resonators. I have one that has 4 resonators. There is more rasp for sure anytime you remove the cats but the resonators help. The non resonated xpipes have a ton of rasp which is why I went with a quad resonated xpipe.

I say buy a dual or quad resonated xpipe, install, and enjoy.
Which midpipe are you running with the 4 resonators?
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