F1 Racing Stage 2 Clutch Kit F1-81132R1-SS Carbonized Kevlar friction material is used on all Stage 2 clutch kit to have higher burst strength and heat tolerance Heavy-duty sprung center with heat treated springs and retainer rivets to increase strength and reliability Plate features special single diaphragm design to increase clamp load. Horsepower Rating: 305 HP, Torque Capacity: 324 ft/lbs Disc OD: 10", Spline: 23