The revision worked and soon a number of Group C and GT teams lined up. When entries closed in April, it had a full field of 58, including the first Ferrari (a GT) to appear since 1984. They also revived the May Test Day (last run in 1987), attracting 32 cars. A number of current and future F1 drivers were in the driver list. A new rule was also included that teams had to qualify the car to be used in the race, to stop abuses with specialised test-cars, and that reserve cars could be qualified in case of accident to the primary cars.