During the resurgence of high-performance in the 1980’s, Buick ditched the conventional V-8 playbook and continued to cultivate its turbo V-6 program, which was manifested in the Grand National. Buick marked the end of the car’s production in 1987 with the limited-production GNX. It was a Grand National on steroids, with a larger turbocharger, a higher, 276-horsepower rating and all-black attire. Only 547 were built and they became instant collectibles.