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      09-23-2012, 09:30 AM   #287
Wrngway
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Drives: '11 328i Sedan A6
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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:
http://realoem.com/bmw/showparts.do?...11&hg=18&fg=20

Here's the N51:


N51 Part#'s:
http://realoem.com/bmw/showparts.do?...87&hg=18&fg=20
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