Originally Posted by Jonmartin
Cause the M3 IS faster.. I'd love to run one modded vs modded it will need over 500hp to walk me though.
It all depends on how much the M3 is putting out, if it is putting out close on 500hp then it will need even more to out run the M3 as it weighs more and is driving an extra axle. But least not get carried away, it S4 isn't a slow car and up to 120mph it won't be a million miles away from the M3.