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Group C rules, he introduced the GTP class for sports prototypes. In 1989, Bishop sold off his organization. After a period of decline in the early 1990s, the Sports Racer Prototype category was introduced in 1993 to replace the top IMSA GTP category in 1994. In deference to the series deviating from the FIA's naming of the class to Sports Racers and Le Mans Prototypes by the French Automobile Club de l'Ouest (ACO)

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