15 Muscle Cars That Were Born to Break the Rules—And Did

5. 1967 Shelby GT500

The 1967 Shelby GT500 was Carroll Shelby’s boldest Mustang to date, fusing unmistakable pony car design with a ferocious big-block 428-cubic-inch V8 under the hood.
Shelby’s obsession with performance led to race-inspired touches throughout, including reinforced suspensions and functional scoops, giving the GT500 both style and substance.
This car wasn’t just about brute force—it was engineered for serious driving, forever changing what enthusiasts expected from an American muscle car. Road & Track