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You didn't ask "what's faster?" but if you must know, a friend of mine with his bone stock DCT E93 M3 versus a stock Z4MR (RPI scoop if it matters), were neck to neck 7 races out of 7 races.
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2014 BMW X5 Sdrive35i F15
2011 BMW 328i E92 LCI
2006 BMW Z4 M Roadster E85
2013 BMW S1000RR K46 R.I.P. 
1998 BMW Z3 Roadster 1.9L E36 SOLD |