OSGiken is a great clutch. The difference with RPS is that you can slip it while stopped using your ebrake+brakes, and build boost before you start moving, just like an automatic :-). Can't do that with OSGiken. The engagement point is bigger than OSGiken too making it a lot more streetable and easy to drive. I know that it will hold a lot of power. I will dyno tune with the new setup soon, you'll see it :-).
Zo
: 4 plate clutch for the Z. ORC does make a 3 plate which is sick enough. I got a super-steal on a HKS triple that will be going on my car. : The rps looks beefy! Keep us informed of it's performance.