 However, after the World Record run of the Callaway Sledgehammer, the AeroBody became an option for the Callaway Twin Turbo Corvette.A total of 51 (B2K) Callaway Twin Turbo Corvettes were ordered that year with a total of 68 cars produced.In 1990, GM finally introduced their ZR-1 Corvette which obtained similar performance characteristics as the 1989 Callaway Twin-Turbo option.