Well, about the dyno, you know you don't have only dyno for small sports cars for example, Ferrari or Mercedes have dyno to test a lots of parameters except the acceleration...And be sure the speed can exceed 250km/h. But, for having tried the M3 (not the CSL) I can believ that it's on opened (flat and excellent ground) road...
Sincerely yours.
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Dream car owner.
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