Spec Clutch SB63ET Super Twin E-Trim Multiplate Clutch Kit

The SPEC SB63ET Super Twin is a high-performance multiplate clutch kit engineered for street and track applications in vehicles producing extreme horsepower and torque (700–1,500 ft-lbs). Despite its race-bred capability, the Super Twin delivers near-stock drivability, making it equally suitable for daily driving, drag racing, drifting, road racing, time attack, pulling, and rallye use.

Key Features:

• E-Trim configuration — precision-trimmed for optimized performance and balance
• Torque capacity: rated for 700–1,500 ft-lbs of torque
• All-billet construction — aircraft-grade aluminum and high-carbon billet steel, milled to an industry-leading .001-inch tolerance for perfect balance and smooth actuation
• Dampened, full-faced carbon graphite friction discs for consistent engagement and long service life
• Multiple friction material options available: organic, fiber, and full metallic
• No shimming or setup required — bolt-in installation for straightforward fitment
• Maintenance-free operation with quiet, smooth engagement
• Rebuildable design — can be serviced by SPEC or by the end user; replacement components and rebuild services are readily available
• Flywheel and track-spec hardware included in every kit

Suitable driving applications include: street, drag, drift, road racing, time attack, pulling, and rallye. The Super Twin's combination of near-OEM drivability with extreme torque capacity makes it one of the most versatile performance clutch solutions available for high-output builds.