40. Plymouth Roadrunner
When it first appeared in 1968, the Roadrunner was an influential, important muscle car. It introduced the new trend of inexpensive and fun cars and was also a strong seller, which affected the whole segment. The idea behind the Roadrunner was simple. It was to present a low-priced but powerful model to attract people with a limited budget but a strong need for performance (via Mecum).
The Roadrunner had a bench seat, no luxury options, and manual steering. But it came with the powerful 383 V8 as the base engine. Also, buyers could also opt for 440 or the mythical Hemi 426. In 1969, the Roadrunner got a convertible option for those buyers who wanted an open-air driving feel.