while most of the import guys won't give the camaro or mustang any credit, the domestics won't give the nsx or type r any credit either...
so i'll begin by saying a camaro can be a good auto-x car with just hoosiers and stiffer springs.
although its mostly the driver, the shorter the wheelbase the faster a car will be through a traditional auto-x course. (thats saying the car has an equal power/weight ratio, good tires, good driver...)