Spec Clutch ST63PT-2MKIV Super Twin P-Trim Dual Disc Clutch Kit

The Spec Clutch ST63PT-2MKIV Super Twin P-Trim is a high-performance dual disc clutch kit engineered for extreme street and track applications. Designed to handle up to 1,156 ft-lbs of torque, this twin disc system is purpose-built for builds running serious power — from drag racing and drifting to road racing and time attack.

Unlike conventional performance clutches, the Super Twin P-Trim delivers near-stock drivability without compromising on holding capacity, making it an ideal solution for high-horsepower builds that still see regular street use. Installation is a direct bolt-in with no shimming, fabrication, or special setup required.

Kit Includes:

• Twin disc clutch assembly with billet flywheel
• New master cylinder
• Billet slave cylinder
• Stainless steel hydraulic lines and fittings
• All necessary installation hardware

Key Features:

• Torque rating: Up to 1,156 ft-lbs
• Disc trim level: P-Trim — dampened, full-faced carbon graphite discs
• Aircraft-grade aluminum and high carbon billet steel construction, milled to within .001 inch for perfect balance and actuation
• Near-stock pedal feel and drivability suitable for street use
• No shimming or setup required — direct bolt-in installation
• Infinitely rebuildable billet flywheel included
• Fully rebuildable by SPEC or the end user; replacement components and rebuild services always available
• Smooth, quiet operation thanks to full billet construction
• Suitable for street, drag, drift, road racing, time attack, and rally applications

The Super Twin series is constructed using aircraft-grade aluminum and high carbon billet steel, machined to industry-leading tolerances for precise balance and actuation. The P-Trim disc specification uses dampened, full-faced carbon graphite friction material, offering a blend of street manners and serious track capability. Every SPEC clutch kit and flywheel carries SFI approval for added confidence in competition environments.