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      02-06-2013, 06:21 PM   #31
Drives: 2012 335is
Join Date: Jan 2010
Location: Littleton, CO

Posts: 421
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Originally Posted by Cozy
Is the 335is N54?

If so I can't see why sticking N55 335i mids on would be an issue, they must follow the same path.

The N55 is a more fuel efficient engine with one large cat in the downpipe. The N54 is fairly polluting and as a consequence has four mid-sized cats to controll its emmissions.
Yeah the 335is has an n54. And that's interesting that the n54 pollutes the air so much more as it is really only about a 5 to 6 year old engine. However i guess technology changes quite rapidly these days.
2012 335is coupe, alpine white with red leather interior
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