Group C
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Group C was a category of sports car racing introduced by the FIA in 1982 and continuing until 1993, with Group A for touring cars and Group B for GTs.
A sticker on a race car from the 1984 24 Hours of Le Mans, denoting the car is part of the Group C category.
The Porsche 956 was a dominant car in its many factory and customer built forms in the early 1980s.
Jaguar XJR-8 at the Goodwood Festival of Speed, 2008.
IMSA
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The International Motor Sports Association (IMSA) is a North American sports car racing sanctioning body based in Daytona Beach, Florida, under the jurisdiction of the ACCUS arm of the FIA. It was started by John Bishop, a former executive director of SCCA, and his wife Peggy in 1969 with help from Bill France Sr. of NASCAR. Beginning in 2014, IMSA is the sanctioning body of the WeatherTech SportsCar Championship, the premier series resulting from the merger of Grand-Am Road Racing and the American Le Mans Series. IMSA is owned by NASCAR, as a division of the company.
American Le Mans Series at Road America, 2007
2014 24 Hours of Daytona, first race of reunified IMSA SportsCar Championship
Cars during the 2020 TireRack.com Grand Prix at Road Atlanta