Sport Touring (ST), also known as Street Tuner, is a former set of regulations for production-based race cars, originally by the SCCA, and later by Grand-Am and IMSA, for the Canadian Motorola Cup (later known as the Grand-Am Cup, KONI Sports Car Challenge/Challenge Series, and finally the Michelin Pilot Challenge), between 1997 and 2018. Class rules dictated these cars have smaller displacement engines, with 4, 5 or 6 cylinders, typically producing around to , typically consisting of smaller sedans, hatchbacks, coupes, and convertibles. Examples of cars competing in this class included the Acura RSX, Acura TSX, Chevrolet Cobalt, Lexus IS300, Mazda RX-8, BMW Z3, BMW 330i, Acura Integra Type R Mini Cooper S, and the Subaru Legacy.