SKUSA started ICC’s in 2002 as an introductory class in the promoto tour. I know that JM racing was pushing the Tony Kart , Vortex combo at the time. Seems like in the first years all the way up to Stars of Tomorrow it was all about TM, Pavesi and CRS. CRS died off pretty quickly after Hurricane Racing closed. Now like Howie said its pretty much TM and Maxter. On the world scene TM, Maxter, IAME, Modenas, Vortex all get entries with TM still being half the grids.