Usta race super stocks at CNS around 15 years ago and they raced karts out their for 1 year they had around 40 karts out there at once dunno what they were running maybe yamahas but they flew. It was around the second year after they paved it. Turn one I saw the worst wreck i think could be possible with a kart or karts, didnt look too fun too me, 3 guys layin out on the track out cold.