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      06-24-2013, 02:43 PM   #73
808MGuy
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Drives: 2009 E90 M3
Join Date: Jun 2008
Location: Oahu, Hawaii

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Quote:
Originally Posted by Chriskm3 View Post
Akra is the quietest exhaust outhere that produces power gains an weight savings. But there is a reason why BMW oem has 4 cats and 2 res.
4 cats is the standard configuration for pretty much every modern car in order to meet emissions requirements.
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09 E90 M3 - Interlagos Blue / Black Novillo / Sycamore Anthracite / Eibach / HRE