Spec Clutch SJ633H Stage 2 Plus Performance Clutch Kit

The Spec Clutch SJ633H Stage 2 Plus Clutch Kit is a high-performance clutch system engineered to bridge the gap between the Stage 2 and Stage 3 clutch offerings. It delivers the smooth drivability and street-friendly engagement feel of a Stage 2, while unlocking 15–20% greater torque capacity for drivers who demand more from their drivetrain.

At the heart of the kit is a multi-friction, full-face disc combining carbon semi-metallic material on one side and Kevlar® on the other — a hybrid construction that balances aggressive grip with manageable pedal feel. A high-clamp pressure plate pairs with this disc to maximize clamping force and torque transfer. The hub is double-sprung with spring cover reliefs for added flexibility, and all hub components are heat-treated for long-term strength and durability. Flywheel torque capacity is rated at 445 lbs.-ft., and the disc measures 11.000 inches in diameter with a 1.125-inch, 10-spline input shaft fitment.

Key Features:

• Multi-friction hybrid disc — carbon semi-metallic on one side, Kevlar® on the other
• Full-face disc configuration for consistent, even friction contact
• High-clamp performance pressure plate
• Double-sprung hub with spring cover reliefs for flex and vibration damping
• Heat-treated hub components for strength and longevity
• 445 lbs.-ft. flywheel torque capacity
• 11.000 in. disc diameter | 1.125 in. – 10-spline input shaft
• Bearing and installation tool kit included

The Stage 2 Plus is well-suited for a wide range of performance driving disciplines including street, drag racing, autocross, road racing, rally, pulling, and drifting — making it one of the most versatile clutch kits in the SPEC lineup.