Exedy Cerametallic Stage 4/5 Twin SD Clutch Kit | 2004-2021 Subaru STI (FM022SD)Exedy SD Type Multi Plate Clutch Kit For high powered applications, EXEDY offers twin and triple Multi Plate clutches. These are designed for high power street action as well as drag, road and rally racing. The twin plate clutches are rated for approximately 500 ft lbs of torque and the triple plates are rated for approximately 800 ft lbs of torque, both figures at the flywheel. Twins come with both spring damper discs or solid discs depending on