The Audi Group S, developed for rally racing, is largely unknown. This one-off car produced in Essen was intended for racing in 1987 but was never put to use. Audi decided to withdraw for safety reasons from the World Rally Championship during the 1986 season that was already underway. A serious accident at the 1986 Portugal Rally – which did not involve an Audi – ultimately prompted the international sport authority FIA to eliminate Group B and the planned Group S from championship racing for the 1987 season. The technical features of the prototype: tubular steel frame, plastic body and four-valve turbocharged mid-engine.