I wont be shock if C63 outperform M3 both on a track and in acceleration. I hope I'm wrong. Its going to be an intresting future.
C63 uses same tires as RS4, Pirelli Corsa tires. Apparently the new C63 done the N-ring in 8.10 min with the Pirelli tires and with the 030 performance package (which include LSD).