Mtbboy: In the past i never thought that the set ups had to be different, but in recent times with the modified cars getting way faster do to brushless i think that it could "possibly" become nessissary. That being said, to be honest I dont know what if anything you would want to change.
Maybe after the novak race i will know more. in the past i have been able to take my winning mod car and win the same 19t race with it, so the future will tell weather that is still possible for anyone to do. the speed difference is becoming greater but for now i think that a good mod set up is still a good stock set up.