My ACT 6 Puck Copper disk just tore up my flywheel really bad have to get a new insert for it. It also wore very very fast!! I probably at max could have gotten 10K miles out of it. It would hold really well but its not good on street unless you like replacing clutches every 6 months.. I switched to RPS Stage III clutch as well. Its not a solid hub and is a combo carbon and copper. I just hope its going to hold the power :-)