I bought the short box stage 1 from Kennedy and Brett suggested that I go with the stock sachs disc...450hp/425ft/tq
Engagement is smooth and with about 25% more pedal effort than stock. I would have gone with the stage 2 and sinterd metal disc but my wife would occasionally drive it and I do not like the light switch style engagement or chatter. I am actually selling my 6 puck disc on ebay right now.
Love this disc. If you want to see the abuse it will take check out my cheesey site below and play the 2 videos. they take a few seconds to load though.
you will love this clutch!!!!