The GT-1 class is inaccurate for a chassis number this high. It would have been a GT-2. The first year of Viper GTS international competition was against the Porsche and the McLaren GT-1 cars. Despite carbon/carbon brakes, and 700+hp engines in the sprint races, the Viper was out of its depth compared to the aforementioned cars. The next season, they switched to a more restricted GT-2 class where they DEFINED the class.