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      03-18-2012, 09:09 AM   #106
mojo_78613's Avatar
Drives: 2011 BMW 1M Coupe
Join Date: Apr 2010
Location: Cedar Park, TX

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Thanks for the reply. I guess it's safe to keep the OEM (N54) midpipe just from an environmental standpoint... Not sure whether people who swapped their midpipes have experienced any odors due to the lack of secondary cats... Cheers!

Originally Posted by EINSER M View Post
if im not mistaken the N54 pollutes more than the N55 that is why secondary cats are needed in the N54 setup.
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