Basically how close would it be between the S3 and Merc? I know the merc would pull away at the higher the speed thanks to the V8 but would the S3 be able to keep with it at the lower speeds (up to 80?)
I'd expect the AMG to pull away quite easily on a decent stretch of road.
As above its a matter of car,driver road and power/weight plus torque.
A Stg2+ S3 would be about even on power/weight but will lose out a lot on torque and top end power.
I would say it would be about evens until the C63 hits it's stride.
A Stg4 S3 is a different matter LOL.
(Couldn't help that for the C63 owner locally who found out. )