Spec Clutch SO603FS Stage 3+ Performance Clutch Kit

The SPEC Clutch SO603FS Stage 3+ Performance Clutch Kit is engineered for high-powered street and strip applications that demand both exceptional torque capacity and manageable engagement characteristics. Designed specifically for Volvo S40 T5 and S60 performance models, this clutch kit delivers professional-grade performance without sacrificing daily drivability.

Advanced Carbon Semi-Metallic Construction:

At the heart of the Stage 3+ design is a full-faced carbon semi-metallic friction disc that provides superior bite, extended service life, and consistent friction coefficient across a wide temperature range. Unlike aggressive puck-style clutches, the full-face design ensures smooth, progressive engagement while maintaining the torque capacity needed for modified engines.

Key Features:

• Full-faced carbon semi-metallic friction material for optimal grip and longevity
• High clamp load pressure plate for increased torque capacity up to 671 ft-lbs
• Double-sprung hub with spring cover relieves for flexibility and reduced driveline shock
• Heat-treated components throughout for maximum strength and durability
• SFI approved for competitive motorsports applications
• Non-ratcheting design for use with SPEC billet single mass flywheel
• Includes pressure plate and friction disc assembly

Performance Applications:

The Stage 3+ is SPEC's flagship clutch for high-horsepower builds that see both street duty and track use. Ideal for drag racing, road racing, autocross, drifting, and rally applications. The manageable pedal feel and smooth engagement make this clutch suitable for daily driving, while the robust construction handles the abuse of competitive motorsports.

Important Installation Notes:

This clutch kit requires the use of a SPEC billet single mass flywheel for proper function and is not compatible with factory dual-mass flywheels. The sprung hub configuration is specifically designed for single mass flywheel applications to provide proper dampening characteristics. Professional installation is recommended to ensure optimal performance and longevity.