The S65 short block (no heads/cams/vanos/etc) is lighter than the S54 short block (which was the basis of BMW's misleading marketing claims), but the S54 long block (complete engine) is lighter than the S65 long block.
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2005 M3 Coupe, 2004 M3 Wagon, 2001 M5 Sedan, 2008 M5 6MT Sedan, 2012 128i M sport
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