Quote Originally Posted by buyalemon View Post
RS4 uses old school Torsen quattro system which easy eats more power than the viscodiff in the R8 ...so if the RS4 puts down 365 hp on the wheels ...the R8 could perhaps put down 385-390 hp! That makes a big difference ...so the M3 will probably walk all over the RS4 above 190 km/h ...but not the R8!
Quite correct buyalemon, the M3 will most likely pull clear air between it and the RS4 but like you say the R8 is indeed a different animal. But is the only racing done discussed on this site about acceleration, even if the M3 holds on to the R8 in a straight line chances are in a few corners the R8 will drift into the distance. After all one is a Coupe and the other is a Supercar, a 997 Carrera S most likely won't stand a chance against the R8, the G rating for roadholding says as much and I doubt the M3 will get to the 997's level.