Spec Clutch ST66PT Super Twin P-Trim Dual Disc Clutch Kit

The Spec Clutch ST66PT Super Twin P-Trim is a high-performance dual disc clutch and flywheel kit engineered for vehicles producing extreme horsepower and torque. Rated to handle up to 1,100 lb-ft of torque, this kit is built for serious street and competition use including drag racing, drifting, road racing, time attack, rally, and pulling applications.

Constructed entirely from billet materials, the Super Twin P-Trim delivers near-stock drivability without sacrificing durability or holding capacity. The all-billet assembly is precision-machined from aircraft-grade aluminum and high-carbon billet steel to industry-leading .001-inch tolerances for exceptional balance and consistent actuation. Dampened, full-faced carbon-graphite friction discs provide smooth, progressive engagement whether on the street or the strip.

Unlike many competition clutch systems, the Super Twin requires no shimming or setup—it installs as a straightforward bolt-in unit. The assemblies are fully user-rebuildable, and replacement components or professional rebuild services are available directly through Spec Clutch, ensuring a long service life and low total cost of ownership.

Kit Includes:

• Dual disc clutch and pressure plate assembly
• Billet steel flywheel
• Billet slave cylinder and master cylinder
• Alignment tool
• Track-spec hardware

Key Features:

• Torque capacity: up to 1,100 lb-ft
• All-billet construction — aircraft-grade aluminum and high-carbon billet steel
• Precision machined to .001-inch tolerance for perfect balance
• Dampened, full-faced carbon-graphite friction discs
• No shimming or setup required — bolt-in installation
• User-rebuildable design with available replacement components
• Smooth and quiet operation
• Suitable for street, drag, drift, road racing, time attack, pulling, and rally