SPEC's Stage 5 features a full-metallic disc with the highest possible friction coefficient. Not suggested for any WRX that gets used on the street. The SPEC Stage 5 has a solid 12-rivet hub and the assembly is heat treated for strength and durability. Best for extreme street and drag racing. Not for street use. Very harsh engagement and lots of noise/chatter.
Torque capacity: 540ft/lbs at the crank
Full-metallic friction material