7. Shelby GT500 Super Snake – $2.2 million
This unique Shelby GT500 was produced as a rolling laboratory to showcase the possibilities of the Mustang platform and test Goodyear’s “Thunderbolt” tire line. It had Le Mans-winning GT 40 race engine, special transmission, suspension, and tires, and was produced in one example.
There were plans for a limited production run, but the proposed price was over $8000, which was an enormous sum in the late ’60s. Recently, this sole example was sold for $2.2 million (via Road and Track).