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In my opinion for a high performance sport sedan/coupe in this class the the M F8x drivetrain is the winner versus the current C63 and the speculated new C63. If you have two turbos, 3.0l and 6 cylinders is enough engine. No need to add the weight that two more cylinders brings. Of course the I6 is the superior 6 cylinder layout. In a couple years there will be 600HP tunes for the S55 engine. The Twin turbo V8 is more suited to the E63 & M5 class car.
I think the BMW wins with the M-DCT or manual transmission options and the active rear differential as well.
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