My 11 SRT8 m6 runs around NHMS with in 1 second of my 01 C5 coupe the SRT is dead stock right down to tires the C5 had R6's and aftermarket brakes, after 10 laps the tires are too hot but the car is flat fun to drive and it will out run a C5 Z06 on the straights and brake with it in to the turns even though it out weighs it by 1K .....