I was using the Southbend Stage 3 Drag. The name of it sounds more aggressive than it really is. IMO this is the clutch everyone should be using up to 650 WHP. OEM like pedal feel, light enough that chatter in non existent, ceramic 6 puck sprung. Held a few high 10 second passes in my car then completely slipped over 700 WHP. It doesn't even smell when it slips, it just completely lets go. Easier on the master, slave, and pedal assembly.

IMO less failures than the ACT design, but I am back on the ACT 2600 and 6 puck sprung now. So far its holding.