Upgraded clutch kit WITHOUT flywheelTorque Recommendations (Measured at the Flywheel): Stage 1Stage 2Stage 2+Stage 3Stage 3+Stage 4Stage 5Kit Part Number:SA781-2SA782-2SA783H-2SA783F-2Torque Capacity:315355405495 Stages 1-3+ recommended for street/strip Stages 4-5 Race only.About SPEC Clutch: SPEC is a Manufacturer of street high performance and racing clutches and flywheels. Featuring Clutch Kits From street kit Stage 1, 2, 2+, 3, and 3+ to Race Kits Stage 4 and 5. And now the SPEC Super Twin with TQ ratings of over 1500 FT TQ ! Every SPEC Clutch Kit and Flywheel has been SFI Approved.Stage 1: Street, Drag, Drift, Road Race, Rally, Pulling, AutocrossStage 1 Clutch Kits feature an integrally molded carbon Kevlar-based, high performance organic lining that offers smooth engagement and excellent life. This lining has an integrally bonded steel backing for strength under high clamp loads and temperatures. The hub comes in either Sprung or Rigid and is application dependent. The double sprung hub features spring cover relieves for flexibility and both hubs use heat treated components for strength and durability. Best for street and many track/off-road applications.Stage 2: Street, Drag, Pulling, AutocrossFeatures segmented or full faced pure Kevlar disc with steel backing. This lining features excellent drivability like the stage 1, but offers slightly longer life and higher torque capacity. The hub comes in either Sprung or Rigid and is application dependent. The double sprung hub features spring cover relieves for flexibility and both hubs use heat treated components for strength and durability. Best for street, drag, pulling and autocross.Stage 2+: Street, Drag, Pulling, AutocrossFeatures a multi-friction disc in a full faced configuration with carbon semi-metallic on one side and Kevlar on the other. Bridging the gap between stage 2 and stage 3, the 2+ offers drivability and engagement quality characteristic of the stage 2, but with a 15-20% higher torque capacity. The hub comes in either Sprung or Rigid and is application dependent. The double sprung hub features spring cover relieves for flexibility and both hubs use heat treated components for strength and durability. Great for street, drag, autocross, road racing, pulling, rally and drift.Stage 3+: Street, Drag, Pulling, AutocrossThe flagship stage for a high powered street or race car that requires a manageable and friendly engagement, the stage 3+ features a carbon semi-metallic full faced material that offers unparalleled life, friction co-efficient and drivability characteristics in one single package. The hub comes in either Sprung or Rigid and is application dependent. The double sprung hub features spring cover relieves for flexibility and both hubs use heat treated components for strength and durability. Great for street, drag, drift, autocross, road racing, pulling, rally and drift.