Spec Clutch ST663 Stage 3 Performance Clutch Kit

The Spec Clutch ST663 Stage 3 Clutch Kit is engineered for heavily modified street and race engines that demand high torque capacity without sacrificing everyday drivability. Delivering a comfortable pedal feel and quick, confident engagement, this kit strikes the ideal balance between aggressive performance and streetable manners — making it a go-to choice for drivers who push their vehicles hard on and off the track.

Key Features:

• High-Clamp Pressure Plate — Maximizes clamping force for superior torque transfer under both low and high stress conditions
• Carbon Semi-Metallic Friction Material — Industry-leading puck clutch design delivering exceptional drivability, long service life, and high torque capacity
• 4 or 6 Puck Sprung Hub Disc Assembly — Standard 6-puck configuration on most applications; 4-puck available upon request for tuned engagement characteristics
• Double-Sprung Hub — Spring cover reliefs provide flexibility and smooth power delivery; heat-treated components ensure lasting strength and durability
• Complete Kit — Includes pressure plate, disc, release bearing, and installation tool kit — everything needed for a full clutch replacement

Driving Applications:

• Street Performance
• Drag Racing
• Drifting
• Road Racing
• Rallye
• Pulling
• Autocross

The Stage 3 kit offers good wear characteristics under both daily driving and sustained high-performance use, making it one of SPEC's most versatile performance clutch solutions for modified vehicles.