Spec Clutch SF143H Stage 2 Plus Performance Clutch Kit

The Spec Clutch SF143H Stage 2 Plus Clutch Kit bridges the gap between the Stage 2 and Stage 3 clutch lineups, delivering a 15–20% higher torque capacity than the standard Stage 2 while preserving the smooth, streetable engagement feel that makes the Stage 2 a favorite for daily-driven performance vehicles. It is purpose-built for modified engines whose power output has exceeded what a standard Stage 2 can reliably handle.

At the heart of the kit is a full-face, multi-friction composite disc combining carbon semi-metallic material on one side and Kevlar on the other. This hybrid friction pairing delivers aggressive torque holding capability without sacrificing the progressive, controllable pedal feel required for street use. The high-clamp pressure plate maximizes clamping force, while the double-sprung hub with spring cover reliefs absorbs driveline shock and reduces wear on transmission components. All metal components are heat-treated for enhanced strength and long-term durability under sustained high-load conditions.

Key Features:

• Full-face multi-friction disc — carbon semi-metallic on one side, Kevlar on the other
• 15–20% higher torque capacity than the SPEC Stage 2
• High-clamp pressure plate for increased clamping force
• Double-sprung hub with spring cover reliefs for vibration dampening and flexibility
• Heat-treated components for strength and long-term durability
• Bearing and installation tool kit included
• Designed, hand-built, and tested in the U.S.A.

Intended Use: Street, Drag, Road Race, Rally, Pulling, Autocross

The SF143H is an ideal upgrade for enthusiasts who have pushed past the limits of a Stage 2 but prefer to maintain daily drivability rather than stepping up to the more aggressive engagement of a Stage 3. Professional installation is recommended.