Plymouth muscle and pony cars are a type of American automobile designed and built by the Plymouth division of the Chrysler Corporation between the mid-1960s and the early 1970s. The vehicles are generally known for their higher-powered engines and sporty design features, such as signature grille designs, curvaceous body lines, and short wheelbases. The most famous Plymouth muscle and pony cars are the Road Runner, Superbird, GTX, Barracuda, and Duster. All of these vehicles sport a powerful V8 engine, custom paint schemes, and specialized design features aimed at making them as fast and street credible as possible. The vehicles have become especially popular in recent years, due to their classic design and powerful performance capabilities.