33. Buick GSX
Backed by steady sales and the great reception of their muscle models, Buick decided to introduce the ultimate muscle car in the form of the legendary and scarce Buick GSX. The GSX stood for Gran Sports Experimental and was, in fact, a visually upgraded Gran Sport with Stage 1 performance package.
The GSX debuted in 1970 with an aggressive graphics package not typical for Buick products. It was available in two bright colors, Saturn Yellow and Apollo White. Also, it came with a front and rear spoiler, functioning hood scoops, side stripes, and Rally wheels. Sadly, Buick produced only 678 examples that year.