When I conjure thoughts of a what classifies as a 'Super Car', I personally think of; the epitome of design (external & mechanical) from that manufacturer for the time, exclusivity, raw power (500bhp+, depending on the era), limited run made, not an everyday car, is road legal, aerodynamic low profile, carries a big price tag & probably without a lot of luxuries to keep the weight down.
This debate has been an interesting insight into what everyone classifies a 'Super Car'. I still think it's mirky between what is a sports car, and what is a Super Car though.
Put it this way, if a Rex can be made to be as quick around a track than a GTR, would this also be thought of as a Super Car by some?