A Viper roadster[not as aerodynamicas a coupe]came to Coney Island in Houston last weekend.He had 50hp bolt on mods,exhaust,chip,etc,plus a 150 nos system;should be 650-675hp[Henessey is in Houston,so lots of fast Vipers].He raced 2 12Rs about 10 times,probably to make sure,his motor was turned,or he wasn't in reverse.I saw the first race,and it looked like the Viper forgot to downshift or something.Smoked would be a good word.I talked to the 12 riders,and they said they would get off the gas and wait for him to catch up;not even a race to 190 indicated,and everything in between.A 650-700hp Viper coupe should do 202-208mph,maybe a problem if you don't have the right gears,pipe etc.If this car was running right,I can't imagine a McClaren,F-40,Diablo,or F-50 being a problem up to 200mph.The McClaren should eventually get you since they will do 220-230.I haven't done the math,but using this as a yardstick,it would take an 800-900hp/3000-3500# car to beat a busa or a 12,stock!!