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      09-13-2010, 04:27 PM   #66
Doug007
Second Lieutenant
 
Drives: Spacegrau 2009 335i 6MT
Join Date: Feb 2010
Location: Houston, TX

Posts: 291
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Quote:
Originally Posted by shockin330i View Post
What cat? I know on the 335i n55 there are no cats or res on the pipes...
I was talking about the cat on the downpipe. Removing/replacing that will yield the biggest gains.

How you do the piping downstream of that isn't going to matter nearly as much...
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