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      08-18-2011, 07:12 AM   #6

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Drives: E82 N51
Join Date: Nov 2010
Location: Southeastern, PA

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According to the EPA's website, there are actually three versions of the 128i engine in the U.S.: Bin 5 N52 (Federal), ULEV II N52 (CARB), SULEV II N51 (CARB). This spans the entire E82 U.S. production (i.e., 2008-present). I'm guessing the CARB version of the N52 has the secondary cats and the Federal version does not.