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      03-09-2015, 03:56 PM   #14
trohde78
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Drives: 2007 e92 335i 6MT
Join Date: Apr 2013
Location: Chicago Suburbs

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Quote:
Originally Posted by jwzimm View Post
When BMW went to the N55 in the 335i they went with a larger, dual core primary cat in the downpipe. There is speculation that the primary cat had to be smaller on an x-drive due to the x-drive hardware in the area. In order to meet emissions they left the secondary cats in place on the x-drive N55's.
OK, I'll buy that reasoning.
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