19. 1971 Ford Mustang Boss 351
In 1971, Mustang received another restyle that would be the final one for the first generation. Once again, the car was bigger in size and weight. Also, it featured a new sharper look with a much wider track. Unfortunately, the Boss 302 and Boss 429 versions were gone. However, the Grande and Mach I stayed, albeit with lower power ratings.
But there was one interesting model introduced in 1971 called the Boss 351. Available for only one year, the ’71 Mustang Boss 351 was one of the rarest Mustangs Ford produced because Ford made only 1,800 of them. It was powered by a highly-tuned version of the 351 V8 engine with around 330 HP. The Boss 351 was fast, good looking, and more expensive than the Mach 1 version of the same model year. Today, it is a truly high-priced collector’s item.