Fastest in what sense? Fastest around a track? Fastest to 60, 100, 200 mph?
BMW Alpina B7 (0-60 4.3s, TS = 194 mph, $128k)
M6 (0-60 4.2s, TS = 189, $106k)
But you have to also consider the M3 GTS (0-60 3.7s, TS = 190, $140k) in the mix. The GTS is likely the fastest of the 3 around any given track.
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