Heavy Duty Pressure Plate:
Clamps load increase of 20% to 50%, Pedal feels stock to moderate, Many SFI Certified to insure safety
Solid Hub (6 Pad) Disc:
Increased torque capacity, Faster shifts, reduced inertia, Very good durability but shortened spline life, Absorbs more heat than 4 pad, Harsh engagement, some chatter. Not recommended for street use.