What is the fastest car in forza 2 and how can i do it

The fastest car is the Audi R8 tdi R1 car, it can get up to 410mph with a gearing glitch, but there is a patch for Xbox Live (Update) that bans this from use, leaving the second fastest car,1966 Ford GT40 MkII the fastest, reaching speeds of 262mph under its own power.
i think you will find the Nissan fairlady is when fully upgraded engine first it is 10 accelaration and 9.4 speed.