Spec Clutch SB663H Stage 2 Plus Performance Clutch Kit

The SPEC SB663H Stage 2 Plus Clutch Kit is engineered for modified and high-performance engines that have outgrown the torque capacity of a standard Stage 2 clutch. Bridging the gap between the Stage 2 and Stage 3, the Stage 2 Plus delivers the familiar street-friendly drivability and smooth engagement feel of the Stage 2 while providing a 15–20% higher torque capacity — making it the ideal step-up for modified engines without sacrificing everyday usability.

The kit features a composite multi-friction disc in a full-faced configuration, with carbon semi-metallic friction material on one side and Kevlar® on the other, delivering excellent wear characteristics and consistent bite. The double-sprung hub includes spring cover reliefs for added flexibility, while heat-treated internal components provide long-term strength and durability under demanding conditions.

Kit Includes:

• High-clamp performance pressure plate
• Composite multi-friction carbon/Kevlar® clutch disc (full-faced)
• High-torque double-sprung hub and disc assembly
• Release bearing
• Installation tool kit

Ideal Driving Applications:

• Street / Daily Driving
• Drag Racing
• Road Racing
• Rally
• Pulling
• Autocross

The SPEC Stage 2 Plus is a trusted choice among performance enthusiasts who need more holding power than a stock or Stage 2 clutch can provide, while still maintaining the pedal feel and engagement quality expected for street-driven vehicles.