IMSA GT was a sports car racing series organized by International Motor Sports Association. Races took place primarily in the United States and occasionally in Canada.
1981 IMSA race at Road Atlanta featuring GTO, GTU, and GTP cars
Robin McCall in the Hoerr Racing GTO Oldsmobile (1987)
Toyota Eagle Mk.III GTP class car
Peter Holden Gregg was an American race car driver during the golden age of the Trans-Am Series and a five-time winner of the 24 Hours of Daytona. He was also the owner of Brumos, a Jacksonville, Florida, car dealership and racing team.
1973 Porsche 911 Carrera RSR of Peter Gregg
Image: Frank Stella BMW M1 Pro Car Art Car.f L (1979)