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The C6 is a generation of the Chevrolet Corvette and the C6.R is the race car version of the C6.
No such thing as a Covette cr. If you mean the C6R or C5R, those are dedicated race cars, where as the BMW M3 is a street car. No contest.
C6 C6R Stingray Stingray Concept ZR1 Z06