jacks-GTB wrote:thanks, i had a feeling it was...
i'm getting a rebuild from MSR so i need a ceramic clutch...

Not necessarily. I agree you'll need increased clamping pressure for it to not slip, but I prefer to have my clutch as the fuse, rather than my gearbox. I think you'll find an organic 6 speed clutch with increased clamp pressure will contain up to 300atw without too much difficulty while still maintaining a reasonable feel and not be simply an on/off switch.
I'd suggest you talk to MS and perhaps also Jim Berry before making an internet purchase.