Spec Clutch SJ401 Stage Performance Clutch Kit - 1

The Spec Clutch SJ401 Stage 1 Clutch Kit is engineered for bolt-on naturally aspirated and mildly modified forced induction engines, delivering a performance upgrade without sacrificing daily drivability. Designed for drivers who demand more from their clutch on the street and at the track, the Stage 1 kit balances enhanced holding power with smooth, predictable engagement characteristics.

At the heart of this kit is a high clamp pressure plate paired with a steel-backed, multi-compound woven organic disc featuring an integrally molded carbon Kevlar-based lining. This construction offers smooth clutch engagement, excellent wear life, and the strength to handle high clamp loads and elevated temperatures. The high torque sprung hub assembly is double sprung with spring cover reliefs for flex and heat-treated components for long-term durability.

Key Features:

• High clamp performance pressure plate for increased torque capacity over stock
• Steel-backed, multi-compound woven organic friction disc with carbon Kevlar-based lining
• Smooth, stock-like engagement ideal for daily driven vehicles
• High torque double-sprung hub assembly with heat-treated components
• Includes release bearing and alignment tool kit for straightforward installation
• SFI approved — every SPEC clutch kit meets SFI certification standards
• Designed and hand-built in the U.S.A.

Suitable Driving Applications: Street, Drag, Drift, Road Race, Rallye, Pulling, Autocross

Installation Note: Unless installing with a new SPEC flywheel, the existing flywheel must be resurfaced prior to installation. A break-in period of a minimum of 450 miles of primarily city and stop-and-go driving is required before full-throttle engagement or speed shifting.