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      11-04-2012, 12:08 AM   #20
Johnny D
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Drives: 2006 BMW 325i
Join Date: Apr 2011
Location: Hot Springs, AR

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2006 BMW 325i  [4.58]
Quote:
Originally Posted by N0OS3 View Post
you know the MMW headers exit at 2.5", right? you're going to downsize?

I think after the crossover (H-pipe) i'm going to hike up the pipe size to 3" all the way back still... i hope it works out for me. ^__^

It's only a 3.0L NA motor. Big diameter exhaust isn't worth it. Plus, if you compare diameter, dual 2.25" has more area than a single 3". Dual 2.5" is just to much for this motor. I'm going with 2.25" to keep the exhaust velocity high thus keeping the torque and hopefully gaining some power.
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Last edited by Johnny D; 11-04-2012 at 12:14 AM.
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