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!
Quote:
Originally Posted by EINSER M
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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