The SPEC Stage 4 is a solid hub version of the Stage 3. The hub is solid 8-rivet and the assembly is heat treated for strength and durability. It is available in 6-puck for the smooth engagement. The Stage 4 is street drivable but not street friendly due to the rigid hub. Best for dedicated drag racing, road racing, rally or drift cars. Not suggested for any street driven 135/335.
-Torque capacity: 508ft/lbs at the crank
-Carbon-Graphite Friction Material
-Compatible with SPEC SB53A-2 flywheel only