Hum yea im still not sure about this class growing i think there still to fast to drive indoors and to expensive/fragile hard to work on . Ive seen a couple of guys practice with them but never enough of them to race.
You do know whats coming back at least at my indoor Carpet track in Bristol, PA and thats open Staduim truck ! They get at least 6 of them sometimes 4 but mostly every weekend theres a class for them but its growing more . So much i bought a T4.1 Factory kit.