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      09-29-2012, 06:10 PM   #198
Dr. G
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Drives: Black e92 335i
Join Date: Apr 2010
Location: Brampton, Ontario

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e92 BMW 335i  [4.41]
Originally Posted by bmwm3redblack View Post
So HP gains don't depend on size?
Power comes from the removal of the cats. Look at the turbos when you remove your downpipes and you'll realize where the real bottleneck on the exhaust side of the system is.

I ran 1/4 miles with 3" and 2.5" downpipes back to back multiple times and could not pickup any difference whatsoever. The times were always identical between the two.
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