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The Grand American Road Racing Association, which operates and sanctions the Rolex Sports Car Series and the Grand-Am Cup Series, is the premier road racing organization in North America. The 14-race 2006 Rolex Series schedule and the 10-race Grand-Am Cup calendar deliver professional sports car racing to key markets throughout North America. In addition it is televised in the United States and Canada on SPEED Channel and distributed globally through ESPN International.

The GS (Grand Sport) class is made up of several factory sports and muscle cars from around the world with performance modifications and full safety systems. The Grand Am Cup is the place where the cars on the street are track tested in endurance racing.

Engines are tuned to produce between 350 and 405 horsepower depending on the car, and the competition is further equalized by a variety of fuel tank capacities that range from 16.5 gallons for the Porsche 966 to 20 gallons for the Pontiac GTO, Acura NSX, Audi S4, Cadillac CTS-V, Lotus Esprit, Chevy Camaro, Pontiac Firebird and all Ford Mustangs. Top speed for most GS cars is 160 mph.