15 Muscle Cars That Were Faster After the Factory Got It Wrong

15. 1974 Buick Century GS

The 1974 Buick Century GS fell victim to stringent emissions regulations, leading to disappointing factory performance. Resourceful owners quickly restored its muscle car character with a few smart engine tweaks, such as upgrading the intake system and enhancing ignition components. These changes brought the Century GS back to life, giving it the performance edge Buick fans craved. Read more about the Century GS’s revival at Hemmings.