The short-lived Plymouth Road Runner Superbird was a highly modified version of the Plymouth Road Runner with well known graphics and horn. It was the factory's follow up stock car racing design for the 1970 season to the Dodge Charger Daytona of 1969, and incorporated many engineering changes and modifications (both minor and major) garnered from the Daytona's season in competition on the track. The car's primary rival was the Ford Torino Talladega, which in itself was a direct response to the Mopar aero car. It has also been speculated[by whom?] one motivating factor in the production of the car was to lure Richard Petty back to Plymouth. Both of the Mopar aero cars famously featured a protruding, aerodynamic nosecone, a high-mounted rear wing and, in the case of the Superbird, a horn which mimicked the Road Runner cartoon character.

Market impact
The Superbird's styling proved to be a little extreme for 1970 tastes (many customers preferred the regular Road Runner), and as a consequence, many of the 1,920 examples built[7] sat unsold on the back lots of dealerships as late as 1972. Some were converted into 1970 Road Runners to move them off the sales lot. In recent years, however, the Superbird has become quite valuable. A Superbird can fetch anywhere from US$300,000 to US$2,000,000. On BarrettJackson, bids for original Superbirds crossed US$1,200,000.Some manufacturers produce Superbird conversion kits for 1970 Road Runners and Satellites.[citation needed] Kits are also available for non produced 1971 and 1972 bodies for the Superbird.

The Superbird and the Dodge Charger Daytona were each built for one model year only (1970 and 1969 respectively).