25. Plymouth Superbird
As one of the craziest muscle cars they ever produced, the Plymouth Superbird was available in 1970 only. In order to homologate the car for NASCAR racing, Plymouth built just under 2000 road going Superbirds, selling them all over America. They based the car on the Roadrunner, giving it the 440 V8 as standard and the 426 Hemi as the only engine option.
However, to make it as aerodynamically efficient as they could, Plymouth installed a nose cone, hideaway headlights, and an enormous spoiler on the back. Also, it transformed the rear glass from the standard concave-shaped one to regular since it proved more slippery in wind tunnel testing.