Actually the viper had a Roe S/C plus spray, thats why at the end it puller real hard past the vette. The Vette was a 408 ci with a S/C. It put down 650rwhp with a very mild cam. Not sure on the vipers hp, but I do know that it runs 9.85 @141mph. As for the stang passing the vette, it only passed it when he was braking.