I've got an OS Giken twin-plate clutch right now, but I'm having problems shifting at high RPM. It doesn't do it ALL the time, but when it does it happens at 7500+ and blocks the shift until the revs drop. I think it may be because I'm using a stock TO bearing instead of the OS/Mazdaspeed TO bearing, but I'm not sure. My motor is out right now and I'm wondering if I should buy the OS Giken TO bearing and new plates for my twin-plate, or just go back to a regular single plate clutch.

I should be in the 500+ whp range with the new setup and ET streets, what kind of single plate will hold up without slipping? I'm thinking about going with a stock flywheel and a 4-puck/heavy PP. I think ACT only rates that combo for 350 ft-lb. Any experienced input would be helpful...