Spec Clutch SB133F Stage 3 Plus Performance Clutch Kit

The Spec Clutch SB133F Stage 3 Plus is the flagship single-disc clutch kit engineered for heavily modified street and race engines that have outgrown the torque capacity of the standard Stage 3. Designed to handle serious power while still delivering better daily drivability and more manageable engagement than a traditional Stage 3, the Stage 3 Plus strikes the ideal balance between aggressive performance and long-term wearability.

At the heart of this kit is a full-faced carbon semi-metallic friction disc, a material chosen for its exceptional combination of friction coefficient, service life, and consistent engagement feel under high heat and load. The disc assembly uses a double-sprung hub with spring cover reliefs for added flexibility, along with heat-treated internal components for strength and fatigue resistance — critical for high-horsepower applications across street and competition use.

Kit Includes:

• High-clamp performance pressure plate
• Full-faced carbon semi-metallic friction disc
• High-torque double-sprung hub and disc assembly
• Release bearing
• Alignment tool

Ideal Driving Applications:

• Street performance (including daily driving on modified vehicles)
• Drag racing
• Drifting
• Road racing
• Pulling
• Autocross and rallye

Spec Clutch products are designed, hand-built, and tested in the U.S.A., ensuring consistent quality and fitment precision across their full range of performance stages and applications.