Plymouth Superbird
The Plymouth Superbird is a 1970-only, NASCAR-focused, aerodynamically enhanced variant of the Plymouth Road Runner, developed as Plymouth's response to the 1969 Dodge Charger Daytona and designed to lure Richard Petty back from Ford; it featured a distinctive nosecone, high rear wing, and 'beep, beep' horn, with three engine options — most notably the rare 426 Hemi — and was built in limited numbers (around 1,935 units) to meet NASCAR homologation rules.