Id say there is a line between Sports car and GT car. The Ferrari 575 is a GT car. The ford GT is, you guessed it, a GT car. The Dodge Viper is a GT car. The Vette (z06 or otherwise) is a Sports car. The Elise, S2000, Old MR2 Turbo, Boxter are sports cars. The miata and the MR-Spyder i dont consider sports cars because while they may be roadsters that handle like go carts, they lack the power to keep them competitive with a sports car (such as the s2000 or the lotus elise or even the boxter). I might put the miata and MR-Spyder into the Bottom rung of the sports car ladder, but they dont get sports car status from me. A LS1 F body will outrun a miata on a road course with long sweepers, but a miata will destroy one on an autoX course.