Plymouth Roadrunner Superbird
Plymouth based this car on the Roadrunner. It came with a 440 V8 motor as standard and the 426 Hemi was 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, they transformed the rear glass from a standard concave-shaped one to a regular-shaped glass, which proved more slippery in wind tunnel testing. Sadly, it was just a one-year-only model for 1970.