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      12-08-2012, 03:01 AM   #7
Amini77
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Drives: Alpine White '13 550i
Join Date: Nov 2011
Location: Tarzana, CA

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2013 BMW 550i  [0.00]
Quote:
Originally Posted by mapleridge View Post
I had custom catless headers done and I have dyno'd. Most of what you were told is simply false. Check my thread for evidence. There was zero increase in sound at all with my design. There were gains of HP and torque all throughout the curve. TQ gains were greater than HP. My MPG has improved noticeably. At times it was up by 20%. Greatest gains were from 2.5k to 3.5k RPM.

http://www.e90post.com/forums/showthread.php?t=772142
Where did you get these done? Pretty simple design right? You think reputable muffler shop can do it?
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