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      09-29-2012, 10:21 AM   #190
psmitty95
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Drives: 2009 E90 335i xDrive
Join Date: Jan 2012
Location: Greenwich, CT/ Dallas, TX

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Quote:
Originally Posted by bmwm3redblack View Post
So HP gains don't depend on size?
I'm pretty sure they do but don't all DP's neck down to 2.5" to meet up with the stock exhaust? If so I don't it going down to 2.5" earlier would have a profound effect.
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