Originally Posted by T Bone
Not to try to engage in a discussion about who has a longer e-penis but tires are by far the biggest influence on a street car's performance. There is no other mod that even comes close to improving a street cars performance.
Wrong, a well design chassis will make more of a difference than the tyres on their own. Even on a track as long as the ring the difference between the M5 and M6 was only 4 seconds, with one using CUP tyres (M6) and the other high performance road tyres (M5).
The M5 and M6 both suffer from too much frontal weight, their weight balance is 55/45% I believe which doesn't help matters when their is over 500hp going to the rear. The best M car ever was the E30 M3 and it's weight balance when more to the rear where the driven wheels where (a better designed chassis).