Well if the C63 has 451 Hp & 444 T
M3 has 414 Hp & 295 T
Intake stage 2 = plus 15hp
x-pipe = plus 21hp
at the end you'll have 450 hp but not the T
weight may help, but the C63 is a Monster, i had one before super storm sandy = (
NOW i got an M3, which is a great car.