I will hunt out the Autocar book and scan the feature but there is no denying that the M3 was only 0.3s aheah at the 150mph mark. And I think but am not sure that the RS4 will they own car and not one supplied by Audi, so no super fast press car in other words.
Like wise when comparing the old M3 with the then S4v8 Avant at the 0-100-0 contest the M3 was only 0.3s quicker to 100mph and was only 0.8s ahead at the end of the straight (can't remember the exact distance), the M3 had reached 143mph, so again here is a much heavier Audi with quattro being only slightly slower.
This is not me disproving that the M3 in both cases isn't quick cars, only that they aren't that much quicker than there competitors and this myth that quattro is eating piles of power isn't true.
I haven't raced any E46 M3s with my S5 but I reckon I would stand a pretty good chance of winning against a stock car and yet both have identical power to weight ratios.