 Group B cars, which was a GT class, were also allowed to race, but entries in this class were sparse, and Group B cars disappeared from the series, with sports-prototypes dominating the championship.Porsche was the first constructor to join the series, with the 956, but soon several other makes joined the series, including Jaguar Cars, Mercedes-Benz, Nissan, Toyota, Mazda and Aston Martin.As costs increased, a C2 class (originally named C Junior) was created for privateer teams and small manufacturers, with greater limits to fuel consumption.