Attributing the definition of ‘sports car’ to any particular model can be controversial or the subject of debate among enthusiasts. Authors and experts have often contributed their own ideas to capture a definition.
A car may be a sporting automobile without being a sports car. Performance modifications of regular, production cars, such as sport compacts, sports sedans, muscle cars, pony cars and hot hatches, generally are not considered sports cars, yet share traits common to sports cars. Certain models can "appeal to both muscle car and sports car enthusiasts, two camps that rarely acknowledged each other’s existences."Some models are called “sports cars” for marketing purposes to take advantage of greater marketplace acceptance and for promotional purposes High-performance cars of various configurations are grouped as Sports and Grand tourer cars or, occasionally, just as performance cars.
PD: la fuente es wikipedia, es una pagina que contiene mucha informacion variada sobre diferentes temas, aunque aveces no es 100% fiable esta muy bien