Thread: The Ultimate 1-Series Buyer's Guide
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      08-23-2020, 08:10 AM   #107
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Quote:
Originally Posted by Gangplank View Post
N52 is ULEV. The N51 is SULEV., which is a higher emissions standard that is used in CA and a bunch of other states. Lots of info on the web.

http://www.tuningforbmws.com/?q=n51-vs-n52-engine
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