One easy way to have higher performance is to have a lighter vehicle.

For example the Ariel Atom is only 300 HP but will do 0-60 in 2.7 seconds (completely naked/no body panels). The drivers sunglasses serve as the vehicle windshield. The most amazing thing about this vehicle other than weight is the boxed frame which hasn't been used in a production car since the 300SL. The difficulty with the stronger box frame is entering and exiting the vehicle which Mercedes solved by making gull wing doors. I imagine a car with no "doors", but a "batmobile" entry and exit and frame like the Ariel Atom with body panels of course.
aa.jpg Here is the Ariel Atom racing: http://www.youtube.com/watch?v=H5vAdNUdVXA