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North America’s top production car-based series returns to Road America for three days of intense racing action! Explore the open paddock, mingle with teams and drivers, and enjoy unprecedented access to over 100 incredible cars featuring manufacturers like Acura, Audi, Bentley, BMW, Ferrari, Lamborghini, McLaren, Mercedes-AMG, Nissan, Porsche, and so much more. This fall, accept the Challenge.