Originally Posted by mojo_78613
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!
i put the N55 mids on my 1M and no change as far as that was concerned
i'd get gas smell on a catless downpipes setup for sure though