4. Chevrolet Corvette C4 Callaway Sledgehammer

Rives Callaway established Callaway Cars in 1977, long after the muscle car craze had ended and high horsepower performance machines were a thing of the past. He specialized in producing turbocharger kits, which were installed chiefly on European cars.

To show the twin-turbo C4’s real potential, Callaway made the legendary Sledgehammer Corvette, a highly modified and heavily turbocharged 1988 Corvette with 898 HP and a top speed of over 250 mph.