15. 1970 Pontiac Grand Prix SJ 455
The 1970 Pontiac Grand Prix SJ 455 was the epitome of the luxury muscle concept, offering power and comfort in equal measure. Its massive 455-cubic-inch V8 engine gave the Grand Prix SJ formidable straight-line performance, while upscale features ensured a plush ride. Positioned between full-size cruisers and agile pony cars, the Grand Prix SJ 455 offered a unique blend of sophistication and muscle, making it a standout for drivers who wanted both prestige and performance.