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      06-05-2009, 02:45 PM   #31
Drives: 2008 E92 335i 6MT SGM CR/BD
Join Date: Jul 2008
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Originally Posted by USCRooЯ View Post
the Riss racing DPs the the 3 - 2.75 - 2.5
the AR ones go from 3 - 2.5
ya I was talking about AR... 3" pipes with 2.5 inch flange openings is WAY too abrupt IMHO. Not saying they don't "work" but that is not ideal for air flow smoothness. RR seems like a pretty good design, but I still don't see why they don't just stay 2.5" the whole way. The entire rest of the system is 2.5"
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