[blykins]

Can't beat a RAM...lots of Club Cobra guys running around with my RAM clutch kits.

I've used the Spec stuff before and they go nuts with their disc materials. For a 650hp rating, they will probably reach for a cross/paddle style disc with a sintered iron material. On/off engagement, chatter, you name it.

The RAM Powergrip HD would probably give you 100hp or so on the safety factor and are very streetable.