Lol, that is a very funny and fake race, just watch the speed the trees go by at. They nevr get over 55 miles per hour,lmao. Grand Nationals are fast cars, but they aren't pushing 550 hp the viper is, you can actually see the guy in the Viper let off of the gas and never really get on the gas.
ALL vipers are V10s. and if they're GNXs then they're tuned by McLearan... the turbo, the suspension , intercooler, and brakes... maybe more i dunno. i forget... i cant afford one. :(