It is the "Atomic Twin" clutch, American Powertrain sells it as their house brand "Science Friction". It is a twin disc ceramic progressive that is supposed to be able to handle over 1000 ft-lb of torque. The progressive part gives it a softer initial bite, it engages one disc slightly before the other.
My car falls into this no mans land where the single disc clutches that can handle the torque are very stiff and have a harsh engagement. This clutch does not require as stiff a pressure plate because the holding force is spread across two clutch discs. It is also not a "typical" button style circle track multi-disc that is on/off like a light switch.