Spec Clutch ST603 Stage 3 Performance Clutch Kit - Carbon Semi-Metallic 4/6 Puck

The SPEC ST603 Stage 3 Clutch Kit is engineered for heavily modified street and race engines that demand aggressive torque capacity without sacrificing daily drivability. Featuring a comfortable pedal feel and quick engagement, this kit strikes the balance between race-ready performance and real-world usability — making it a top choice for high-output builds across a wide range of motorsport disciplines.

At the heart of the Stage 3 kit is a carbon semi-metallic puck disc paired with a high-clamp pressure plate and a high-torque sprung hub assembly. The disc hub is double-sprung with spring cover reliefs for added flexibility, while heat-treated components ensure long-term strength and durability under both low and high stress conditions. The standard configuration uses a 6-puck disc, though a 4-puck disc can be specified at the time of ordering depending on application requirements.

Kit Includes:

• High-clamp performance pressure plate
• 4 or 6 puck carbon semi-metallic friction disc (6-puck standard on most applications)
• High-torque sprung hub and disc assembly
• Release bearing
• Installation tool kit

Ideal Driving Applications:

• Street
• Drag Racing
• Drift
• Road Racing
• Rallye
• Pulling
• Autocross

The SPEC Stage 3 clutch line has established itself as a benchmark in puck clutch drivability, service life, and torque capacity, making the ST603 a trusted upgrade for performance enthusiasts who demand more from their drivetrain.