The Stage 1 clutch kit uses an upgraded pressure plate with increased clamping pressure, combined with an organic friction disc.
The Stage 2 clutch uses an upgraded pressure plate combined with a ceramic friction disc in sprung configurations.
The stage two clutch range is designed for road and track going vehicles that require a higher torque capacity and temperature tolerance, and faster engagement. Clutch engagement is more aggressive than stage 1, so it is not recommended for daily driven vehicles.
The sprung ceramic clutch kits - Stage 2R use an upgraded pressure plate combined with a ceramic friction disc in sprung configurations.