Muscle car is a description according to Merriam-Webster Dictionary that came to use in 1966 for "a group of American-made two-door sports coupes with powerful engines designed for high-performance driving." Wikipedia

Type of high-performance car Wikidata

Any of a variety of automobiles, especially American sedans from the 1960s and early 1970s, that are modified to look and perform like race cars and equipped with large, powerful V8 engines that allow for quick acceleration to high speeds; but still designed for travel on regular highways. Wiktionary

Variety of automobile. Wiktionary (translation)