Spec Clutch SB551 Stage Performance Clutch Kit - 1

The SPEC Clutch SB551 is a Stage 1 performance clutch kit designed for BMW 335i and 435i models equipped with the N55 engine. This high-quality clutch kit delivers smooth engagement with stock-like daily drivability while offering significantly improved performance and durability over the factory clutch.

Key Features:

• Integrally molded carbon kevlar-based high performance organic lining for smooth engagement and excellent service life
• Steel-backed construction with integrally bonded backing for strength under high clamp loads and temperatures
• Double sprung hub with spring cover relieves for flexibility and reduced drivetrain shock
• Heat treated components for enhanced strength and durability
• High clamp pressure plate for improved torque capacity
• Multi-compound woven organic clutch disc with high torque sprung hub assembly
• Includes alignment tool for proper installation

Applications:

• Ideal for street driving, high performance street use, and light drag racing
• Suitable for bolt-on naturally aspirated and mildly modified forced induction engines
• Also appropriate for track days, drifting, road racing, autocross, and pulling applications

Important Installation Notes:

• This application uses a concentric hydraulic slave/bearing assembly rather than a conventional throwout bearing
• Designed for use with stock BMW flywheels or SPEC billet flywheels (SB55S or SB55A)
• Existing flywheel must be resurfaced prior to installation to ensure proper friction surface integrity
• Requires 450-mile break-in period with city/stop-and-go driving before full throttle engagement

SPEC clutches are manufactured in the USA using the highest quality materials and are hand-built and tested to exacting standards. The SB551 Stage 1 kit provides the perfect balance of enhanced performance and everyday usability, making it an excellent upgrade for enthusiasts who demand more from their BMW without sacrificing driveability.