As with the World Rally Car specification, Super 1600 requires a production-standard bodyshell that is made safe for competition with the addition of a roll cage. Certain other modifications can be made to increase the width of the bodywork and improve its aerodynamic efficiency.
The Super 1600 class, similar to the World Rally Car specification, demands a production-ready body shell that is safe for racing with a roll cage.  Additional modifications can be made to increase the body's width and improve its aerodynamic efficiency.