be honest, theres a (street full face disc), then the six puc. its weird. i would say a stage three. but act might say stage two. you gotta remeber that its a non sprung disc, only stage three use those. holds up at 550rwhp, so i think its good.
i used it for about 4 months, then the car sat for a year, then when after i picked up my rhd chasis, i came up on a hks twin plate. so i changed it. my hp goals where getting higher, and i personaly felt that the act might not hold at 650-750rwhp. the fly wheel and clutch have been sitting for a year and a half now. its taking up space.