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      09-14-2011, 10:02 AM   #17
ken1137
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Drives: a slow 2009 e90 335i
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2009 e90 335i  [3.20]
Quote:
Originally Posted by Imo135 View Post
Hi, what does the delete of cats on a N54 with replacment with the N55 mid pipes do for performance, i.e horse power and throttle response? Will it be picked up by BMW or can we still maintain our warranties?
??? delete of cats would increase flow and hp. BMW and warranty is another reason I did not change the down or mid pipes.
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