In short: Special clutch disc that can handle higher torque levels. For whom: For 9000 owners wanting to upgrade beyond stage 3 without having to replace pressure plate! Details: 6 puck Carbon friction plate capable of handling higher torque levels with stock pressure plate. Provides better driveability and smoother clutch engagement than a conventional sintered friction plate and retains the light feel of the stock clutch pedal. Torque capacity 550 Nm with stock pressure plate (Aero).