Quote:
Originally Posted by Babyjoe1973
Who told you that the N55 as no secondary cats? It has! Check RealOEM. N54 and N55 have the same mid-pipes with resonator and secondary cats!!!
Babyjoe
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I have a 2011 135i with the N55 and I can assure you it has
no secondary cats in the mid pipe. I was just under the car last week doing a oil change. It only has a resonator in the midpipe.