The rules for the Group 5
The rules for the Group 5 (special production cars) were the following:
Special production cars have no minimum production volume. But they have to be derived from homologated Group 1, 2, 3 or 4 cars. All of the modifications for the groups mentioned before are allowed plus the ones allowed for the Group 5. The body may be modified as desired in terms of wheel housing and aerodynamic aids – front and aft. Under the skin there is freedom in designing aggregates, engine, gearbox, suspension and brakes. The corresponding regulations are described in more detail in the international motorsport-regulations.