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      06-15-2009, 08:48 AM   #12
scottp999
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Drives: 4runner SR5
Join Date: Mar 2007
Location: MD

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2007 BMW 335  [4.50]
magnaflow 59995 looks like 2.25" which is probably good for a stock system (which is 2.36"), 59956 is 2.5" for most aftermarket catbacks, and then 59959 @ 3" is what AR Design uses in their downpipes.

http://www.car-sound.com/02product/u...al/599spun.asp