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      09-23-2012, 09:30 AM   #287
Wrngway's Avatar
Drives: '11 328i Sedan A6
Join Date: Jul 2011
Location: D.C. Metro

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Concerning N51 vs N52 exhuast. It's the section after the secondary cats that is different.

After checking on realoem, both engines do have secondary cats. It looks like the muffler & resonator are one part in the N51 (Rear Exhaust PN 18307572671), whereas the N52 they are two seperate parts (Center Muffler PN 18307567138 & Rear Muffler PN 18307566941). Pictures may explain better.

Here's the N52:

N52 Part#'s:

Here's the N51:

N51 Part#'s:
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