Originally Posted by !LEFTCOAST!
I really don't know but it states it on the front pages of the installation instructions & on Injen's website. Something about they're considered to be LEV2, SULEV with engine test groups #'s 7bmxv03.0n51 & 8bmxv03.0n51
I always found this exclusion to be confusing, but this is how I read it:
LEV2 or LEV II is the name of the emissions program, or standard. LEV is the rating, along with ULEV and SULEV. BMW 335i's meet LEV2 LEV standards. I believe this comment/exclusion was just included on every 1-series/3-series in this group of testing, and is simply stating that the N51 engine (which is a LEV2 SULEV rated system) is excluded. As far as I can tell, these intakes are CARB certified for N54 engines.
My take anyways.