IMSA, North America’s top sportscar series, returns to Road America for a six-hour endurance race. IMSA races feature sportscars from nearly 20 manufacturers, including Mercedes, Ferrari, Chevrolet, and Aston Martin. The six-hour format puts Road America alongside endurance classics such as the 24 Hours of Daytona, 12 Hours of Sebring, Six Hours of The Glen, […]