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      09-09-2012, 12:46 AM   #2
CanadianDriver
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Drives: 2013 X3 28i
Join Date: Jun 2008
Location: Canada

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it may have something to do with the limitations of older engine designs as well. your 2000 323i has the double vanos M54 (if i'm not mistaken). later model N52s add valvetronic and can get 33 on the highway.