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Sports car racing = grand touring car racing + sports prototype racing
Grand touring (race) car = a road sports car (not necessarily a grand tourer) modified for improved preformance on track.
Sports prototype = a purposely-built race car with closed wheels and a non-touring car shape.
I'm not totally sure about where to put Japanese Super GTs and Grand-Am GT Prep 2 cars, since they fit into the latter definition but are commonly considered as grand tourers.
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