Callaway Sledgehammer
Rives Callaway established Callaway Cars in 1977, long after the muscle car craze wound down. At that time, high-horsepower performance machines were a thing of the past. He specialized in producing turbocharger kits to be installed chiefly on European cars. His knowledge and the start of the turbo era perfectly lined up, making the company take off (via IMSA).
To show the real potential of the twin-turbo C4, Callaway produced the legendary Sledgehammer Corvette. A highly modified and heavily turbocharged 1988 Corvette that had 898 hp and could go over 250 mph. Only two cars were built and tested. Even though it was a road-legal vehicle, it was essentially a prototype.