 In this lower class, most cars used either the BMW M1 engine or the new Cosworth DFL, but, like in the main class, a variety of solutions were employed by each individual manufacturer.Alba, Tiga, Spice and Ecurie Ecosse were among the most competitive in this class.While the Group C formula had brought manufacturers back to the sport, it was again Porsche - with its 956 & 962 Group C line - that continued their domination of the sport.