Viper Competition Coupe. Affordable factory built and so dominating it is required to run restrictors and 150lbs of additional weight so the competition can be...well, competitive.
Viper GTSR. Total domination 1997- 2000
Ferrari Challenge. Because y'gotta respect a company that for 60+ years has built cars for one purpose and has never built a minivan or SUV.
Honorable mention goes to Porsche.