Spec Clutch SZ423H Stage 2 Plus Performance Clutch Kit

The Spec Clutch SZ423H Stage 2 Plus Clutch Kit is engineered for modified engines that demand more torque capacity than a standard Stage 2 clutch can deliver. Bridging the gap between the Stage 2 and Stage 3, this kit provides the familiar street-friendly feel and engagement quality of the Stage 2 while delivering a 15–20% higher torque capacity — making it the ideal upgrade for performance builds that have outgrown a stock or mild clutch.

At the heart of the Stage 2 Plus is a composite multi-friction disc in a full-faced configuration, combining carbon semi-metallic material on one side with Kevlar® on the other. This hybrid friction material delivers excellent wear characteristics, smooth engagement, and the durability needed for both street and competition use. The double-sprung hub features spring cover reliefs for flexibility, along with heat-treated components for long-term strength and reliability.

Key Features:

• High-clamp performance pressure plate for increased clamping force
• Composite multi-friction disc — carbon semi-metallic on one side, Kevlar® on the other
• Full-faced disc configuration for consistent torque transfer and wear life
• Double-sprung hub with spring cover reliefs for smooth, flexible engagement
• Heat-treated hub components for superior strength and durability
• High-torque sprung hub and disc assembly
• Includes release bearing and installation tool kit

Intended Use: Street, Drag Racing, Road Racing, Rally, Pulling, Autocross, and Drift

Designed, hand-built, and tested in the U.S.A., the SPEC Stage 2 Plus is the performance clutch of choice for drivers who demand more from their drivetrain without sacrificing daily drivability.