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Plymouth Superbird
As one of the craziest muscle cars they ever offered, Plymouth produced the Superbird with one of the most recognizable designs ever. To homologate the car for racing, during the 1970 model year only, Plymouth built just under 2,000 road-going Superbirds, selling them all over America. They based the car on the Roadrunner. It came with a 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 that was more slippery in wind tunnel testing.