"Pony car" is the class of American pseudo-sports cars. The name derives from the Mustang, which was the first of the type, but it generally refers to the entire class comprised of the Mustang and it's competitors, so it also includes the Camaro, Firebird, Barracuda, and Javelin. Not really "high end" at all. They were originally intended to be affordable alternatives to pricier European sports cars.