A muscle car is a term used to refer to high-performance automobiles, typically American-made with two doors and a powerful V8 engine. These cars are characterized by their large displacement engines, heavy weight and rear wheel drivetrain layout. Muscle cars were originally designed for street racing, with the goal of offering maximum power in combination with handling and agility. The most popular models include the Chevrolet Camaro, Pontiac Firebird, Ford Mustang and Dodge Challenger.