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      11-04-2012, 01:08 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]
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.

Last edited by Johnny D; 11-04-2012 at 01:14 AM.