Spec SC663H Stage 2+ Clutch Kit - High-Torque Carbon/Kevlar Performance Upgrade

The SPEC SC663H Stage 2+ Clutch Kit is engineered for modified engines that demand more torque capacity than a standard Stage 2 clutch can support, while still preserving excellent street drivability. Bridging the gap between the Stage 2 and Stage 3, this kit delivers a 15–20% higher torque capacity rated up to 715 ft-lbs without sacrificing the smooth engagement feel that makes the Stage 2 a daily-driver favorite.

Key Features:

• Multi-friction composite disc in a full-face configuration — carbon semi-metallic material on one side, Kevlar on the other — for optimal grip and wear resistance
• High-clamp pressure plate for increased clamping force over stock
• Double-sprung hub with spring cover reliefs for flexibility, plus heat-treated components for long-term strength and durability
• Rated up to 715 ft-lbs of torque at the flywheel
• Maintains Stage 2 engagement feel for excellent daily drivability alongside strong performance potential
• Includes high-torque sprung hub and disc assembly, bearing, alignment tool, and pilot bushing

Important Installation Note: This application does not use a conventional throwout bearing — it relies on a concentric hydraulic slave/bearing assembly. The concentric slave cylinder is available as a separate option. Resurfacing the factory flywheel is strongly recommended prior to installation unless fitting a new SPEC flywheel to factory specs. A break-in period of at least 450 miles of primarily city/stop-and-go driving is required before full-throttle engagement or drag launches.

Ideal Driving Applications: Street, Drag, Road Race, Rally, Autocross, Pulling, Drift