 Class B was for cars between two and three litres of engine capacity.Turbo charged cars acquired a multiplier of 1.3, meaning a 2000cc car with a turbo became a car with 2600cc for the purposes of the class structure.This saw the factory supported turbo charged Mitsubishi Starions and Volvo 240s compete against non-turbo Audi 5+5, Toyota Celica Supra and the factory backed Alfa Romeo GTV6.