[1SerieStud]

Originally Posted by perral1

I'm not an N54 guy - I've got an N55 - but everything I've ever read or heard says the midpipes have cats on the N54. RealOEM lists them as cats:
http://realoem.com/bmw/showparts.do?...70&hg=18&fg=10

And if you still don't believe me, maybe you'll trust Berk:
http://www.1addicts.com/forums/showp...3&postcount=19

But the N55 definitely does NOT have secondary cats (also in the above post by Berk).

Hey I'm not an N54 guy either....most I know about the N54 I have read (since I can't just slide under the car to see it for myself), so there is a high chance I could have read something erroneous. This being said, I stand corrected.

However, for the sake of this thread, it is important to make sure that everyone is informed about the N55 only having 1 single cat (on the downpipe), one single resonator (right before the muffler and after the midpipes), and absolutely nothing (no resonators or cats) on the midpipes themselves.