Buick GNX
The GNX was the poster child of 1980s engineering and a car that was so popular that GM couldn’t keep them on dealership lots. What made the GNX so popular was the turbocharged engine and the blacked-out styling. There was nothing Buick liked about this car and that attracted consumers even more (via Classic Industries).
The GNX was and still is one of the most highly regarded cars that came out of this era. Miami Vice featured the car heavily because it was so popular back then. The GNX had the performance of an exotic car without straying too far from the fence, and it was a twin-turbo-powered car, which was a new thing for GM.