Fits 1989-2002 Nissan Skyline models equipped with the RB26DETT engine (R32, R33, and R34 chassis).

The SPEC Stage 3+ Clutch Kit (SN263F) is engineered as a high-performance hybrid solution for high-torque street and track applications. This kit features a flagship carbon semi-metallic friction material bonded to a full-face disc. This design provides the high heat capacity and torque rating of a race clutch while maintaining the smooth engagement and long-term durability of a street-friendly full-faced disc. The assembly is built to handle significantly increased power levels over the stock unit without the harsh engagement typical of multi-puck designs.

• Manufacturer Part Number: SN263F
• Friction Material: Carbon semi-metallic
• Disc Style: High-torque full-face disc
• Pressure Plate: High-clamp load design
• Included Components: Pressure plate, friction disc, alignment tool, and required hardware
• Application: Ideal for high-horsepower street, drag, and circuit use

Designed for Nissan vehicles equipped with RB20 and RB25 engines.

The SPEC Stage 2+ Clutch Kit (SN233H) provides a significant upgrade in torque capacity for performance-driven street and track applications. This kit bridges the gap between a standard Stage 2 and Stage 3 unit, utilizing a hybrid multi-friction disc that offers a higher coefficient of friction than pure organic linings while maintaining manageable engagement for daily use.

• Manufacturer Part Number: SN233H
• Hybrid friction disc construction for increased heat resistance and longevity
• High-clamp pressure plate engineered to handle elevated torque loads
• Designed specifically for RB20 and RB25 drivetrain configurations
• Provides a smooth, consistent pedal feel with aggressive holding power

The SPEC Stage 3+ Clutch Kit (SN233F) is a flagship high-performance solution for Nissan RB20 and RB25 engines. Engineered for high-torque applications that demand a balance between track-ready holding power and street-legal drivability, this kit replaces the factory clutch assembly with a significantly higher friction capacity system.

At the core of the Stage 3+ kit is a full-faced carbon semi-metallic friction disc. Unlike traditional puck-style racing clutches, the full-face design provides a larger surface area for better heat dissipation and smoother engagement while maintaining the high friction coefficient required for forced induction or high-displacement builds. This kit is ideal for modified street cars, drag racing, and road racing where consistency and durability are paramount.

• High-clamp pressure plate specifically tuned for RB-series engines
• Full-faced carbon semi-metallic friction material for maximum torque capacity
• Excellent wear life and heat management during aggressive shifting
• Maintains manageable pedal feel and engagement for street use
• Manufacturer Part Number: SN233F

The SPEC Clutch Stage 3 Clutch Kit (SN233) is a high-performance upgrade designed for Nissan RB20 and RB25 engines. This kit is engineered for vehicles that have exceeded the torque capacity of street-friendly Stage 1 or 2 units, making it an ideal choice for high-horsepower street/strip builds, drifting, and dedicated track use.

• High-Torque Capacity: Features a carbon semi-metallic 6-puck sprung disc designed for aggressive engagement and superior heat management under heavy loads.
• Heavy Duty Pressure Plate: Optimized clamping force to prevent slippage while maintaining a manageable pedal feel.
• Sprung Hub Design: Reduces driveline shock and vibration compared to rigid discs, protecting your RB-series gearbox during rapid shifts.
• Complete Installation: Includes the high-clamp pressure plate, 6-puck clutch disc, release bearing, and alignment tool.
• Engine Compatibility: Specifically for Nissan RB20 and RB25 series engines.

Manufacturer Part Number: SN233

Fits Nissan vehicles equipped with the RB20DET engine.

The SPEC Stage 1 Clutch Kit (SN231) is engineered for performance-oriented street driving and light track use. This kit offers a substantial increase in torque capacity over the factory assembly while maintaining a pedal feel close to stock. It is the ideal upgrade for naturally aspirated or mildly modified turbocharged applications that require reliable engagement without the harshness of a full race clutch.

• High-clamp pressure plate provides increased holding power for modified engines.
• Steel-backed woven organic friction material ensures smooth engagement and extended wear life.
• Heavy-duty sprung hub design helps dampen drivetrain harmonics and protects the transmission gearset.
• Direct bolt-on replacement for the original equipment (OE) clutch.
• Manufacturer Part Number: SN231

Fits 1999-2004 Ford Mustang Cobra models equipped with SPEC SF84A aluminum flywheels.

The SPEC SF84FPK Flywheel Friction Plate is a precision-engineered replacement kit designed to restore the performance and longevity of your SPEC aluminum flywheel. Instead of replacing the entire flywheel assembly when the friction surface becomes worn or heat-damaged, this kit allows for a cost-effective rebuild, ensuring your clutch has a fresh, true surface for optimal engagement and torque transfer.

• Specifically designed for SPEC aluminum flywheel part number: SF84A
• High-quality steel friction surface for consistent bite and heat dissipation
• Provides a flat, clean mating surface for new clutch discs
• Includes all necessary mounting hardware for the friction plate
• Manufacturer Part Number: SF84FPK

Fits 2011-2014 Ford Mustang GT and 2012-2013 Ford Mustang Boss 302 (5.0L).

The SPEC Stage 2+ Clutch Kit is a high-performance upgrade designed for the 5.0L Coyote and Road Runner platforms. This kit features a hybrid friction surface that bridges the gap between pure streetability and track-ready performance. By utilizing a multi-segmented Kevlar disc on one side and a carbon-graphite semi-metallic material on the other, the Stage 2+ offers a significant increase in torque capacity and heat management without the harsh engagement typical of a full metallic race clutch.

The 9-bolt cover design ensures a precise fit to the factory-style flywheel, providing consistent pressure plate loading for reliable power transfer under load. This kit is ideal for modified naturally aspirated engines or street-driven cars with light forced induction.

• Manufacturer Part Number: SF503H-9
• Friction Material: Hybrid Kevlar and Carbon-Graphite
• Pressure Plate: High-clamp 9-bolt cover design
• Fitment: 2011-2014 Ford Mustang 5.0L applications
• Included: Pressure plate, friction disc, and necessary alignment tools

Fits 2012-2013 Ford Focus ST (2.0T).

This SPEC aluminum flywheel is engineered to replace the heavy factory unit in the 2012-2013 Ford Focus ST. By significantly reducing rotational mass, this flywheel allows the 2.0T EcoBoost engine to rev more freely, providing crisper throttle response and improved acceleration through the gears.

Precision-machined for exact fitment and balance, this lightweight aluminum component reduces the moment of inertia without compromising durability. It is an ideal upgrade for enthusiasts seeking to optimize drivetrain performance during spirited driving or track use.

• Fits 2012-2013 Ford Focus ST (2.0T EcoBoost)
• High-quality aluminum construction for reduced weight
• Improves engine response and acceleration
• Direct replacement for the factory flywheel
• Manufacturer Part Number: SF33A-4

Fits 2013-2014 Ford Focus ST (2.0T).

The SPEC Stage 2+ Clutch Kit (SF333H-4) provides a significant upgrade in torque capacity for the EcoBoost platform, bridging the gap between street performance and track readiness. This hybrid-material clutch is designed to handle increased power levels while maintaining smooth engagement characteristics suitable for daily driving. Important Note: This kit must be used with SPEC flywheel part number SF33A-4; it is not compatible with the original equipment (OE) flywheel.

• Manufacturer Part Number: SF333H-4
• Application: 2013-2014 Ford Focus ST (2.0T)
• Kit Series: Stage 2+
• Hybrid friction material for improved heat management and durability
• High-clamp pressure plate included
• Requires SPEC Flywheel SF33A-4 for installation

Fits 2013-2014 Ford Focus ST (2.0T).

The SPEC Stage 3+ Clutch Kit is a flagship high-performance street and track solution designed for the EcoBoost Ford Focus ST. This kit bridges the gap between daily drivability and race-ready torque capacity, featuring a full-faced carbon semi-metallic friction material. The sprung-hub design aids in dampening drivetrain vibrations, while the high-clamp pressure plate ensures reliable engagement under increased boost levels.

Important Installation Note: This clutch kit must be used with SPEC flywheel part number SF33A-4; it is not compatible with the OEM dual-mass flywheel.

• Manufacturer Part Number: SF333F-4
• Series: Stage 3+ (Street/Strip)
• Friction Material: Carbon Semi-Metallic
• Disc Style: Full-faced sprung hub
• Included Components: Pressure plate, high-torque clutch disc, and alignment tool
• High-torque capacity with smooth, non-on/off engagement

Fits 2013-2014 Ford Fiesta ST (1.6T).

The SPEC Stage 1 Clutch Kit is an ideal performance upgrade for Ford Fiesta ST owners who need increased torque capacity for street use and spirited driving. Designed to handle basic bolt-on modifications and light track duty, this kit provides a significant increase in clamping force over the factory unit while maintaining smooth, predictable engagement and comfortable pedal effort.

• High-clamp pressure plate for improved power transfer
• Performance organic friction material for durability and smooth street operation
• Designed as a direct replacement for the original equipment clutch
• Ideal for daily driven vehicles with light modifications
• Manufacturer Part Number: SF331-9

Fits select 1985-1991 Chevrolet Beretta, Cavalier, Corsica and Pontiac Fiero, Grand Am, and Grand Prix (2.8L).

The SPEC Stage 3+ Clutch Kit (SC883F) is the flagship high-performance street and track solution for the 2.8L V6 powertrain. This kit features a carbon semi-metallic full-faced friction disc that delivers a significantly higher torque capacity than standard Stage 3 puck-style clutches while maintaining the smooth engagement and drivability required for daily use. It is engineered to handle high-horsepower naturally aspirated builds and forced induction applications where thermal management and holding power are critical.

• Friction Material: High-performance carbon semi-metallic full-faced disc
• Torque Capacity: Significantly increased over OEM and Stage 2/3 kits
• Engagement: Sharp but streetable engagement without the chatter of puck-style discs
• Components Included: High-torque pressure plate and carbon semi-metallic friction disc
• Transmission Compatibility: Fits 5-speed manual transmission applications
• Manufacturer Part Number: SC883F

Fits select 1997-2007 Chevrolet Corvette, Camaro, Pontiac Firebird, GTO, and Cadillac CTS-V.

The SPEC SC75A Aluminum Flywheel is designed to replace the heavy factory unit, significantly reducing rotational mass to allow the engine to rev more freely. This reduction in inertia improves throttle response, acceleration, and rev-matching capability during spirited driving or track use. By minimizing the parasitic drag on the drivetrain, this flywheel ensures more efficient power delivery from the crankshaft to the ground.

• Manufacturer Part Number: SC75A
• Lightweight aluminum construction for reduced rotational mass
• Designed for high-performance street and track applications
• Direct fit replacement for original equipment (OE) flywheel mounting points
• Enhances engine responsiveness and acceleration through the powerband

This component is an essential upgrade for LS-platform enthusiasts looking to maximize the efficiency and powertrain performance of their vehicle.

Fits 2005-2009 Chevrolet Corvette models, including Base, Z06, and 427 Limited Edition variants (6.0L, 6.2L, and 7.0L engines).

The SPEC Stage 3 Clutch Kit is a high-performance upgrade designed for street and track applications that require increased torque capacity. This kit (SC663-2) replaces the factory clutch assembly while maintaining full compatibility with the original equipment factory flywheel, making it an efficient solution for drivers seeking improved engagement and power holding without the need for an aftermarket flywheel.

• Manufacturer Part Number: SC663-2
• Performance Level: Stage 3
• Engine Compatibility: 6.0L, 6.2L, 7.0L V8
• Fitment: 2005-2009 Chevrolet Corvette
• Installation Note: Designed for use with the factory flywheel (FW)

Fits 2005-2013 Chevrolet Camaro SS and Corvette models, including Base, Z06, and 427 Limited Edition Z06.

The SPEC Stage 3 Clutch (MPN: SC663) is a high-performance upgrade designed for street and track applications that require significantly increased torque capacity. This kit replaces the factory clutch assembly with a high-clamp pressure plate and a performance-grade disc to ensure reliable power transfer and improved heat management under aggressive driving conditions.

• Manufacturer Part Number: SC663
• Performance Level: Stage 3
• Application: High-torque street and strip use
• Fitment: Direct replacement for 2005-2013 Chevrolet LS-based performance vehicles

Fits select 2005-2013 Chevrolet Camaro SS and Corvette (6.2L).

The SPEC SC57S Steel Flywheel is a high-performance replacement designed for drivers seeking enhanced durability and consistent clutch engagement. CNC machined from billet steel, this flywheel offers significant strength advantages over stock cast-iron components, making it well-suited for high-torque street use and performance driving. It provides a clean, flat friction surface to optimize clutch response and longevity.

• Manufacturer Part Number: SC57S
• Material: Billet Steel
• Engine Fitment: 6.2L
• Precision CNC machined for optimal balance and fitment
• Direct replacement for the factory flywheel

Vehicle Fitment:

• 2010-2013 Chevrolet Camaro SS
• 2008 Chevrolet Corvette 427 Limited Edition Z06
• 2005-2007 Chevrolet Corvette Base
• 2006-2009 Chevrolet Corvette Z06

Fits 2007-2009 Pontiac Solstice GXP and Saturn Sky Red Line (2.0T).

The SPEC SC40A-2 aluminum flywheel is engineered to reduce rotational mass, allowing for significantly faster throttle response and improved acceleration. By replacing the heavy factory flywheel with a lightweight billet aluminum unit, you reduce the engine's moment of inertia, letting the turbo spool and the engine rev more freely. This is a critical upgrade for high-performance builds where power delivery and engine braking responsiveness are priorities.

• Precision machined from high-strength billet aluminum
• Replaceable steel friction surface for long-term serviceability
• Engineered to reduce rotational inertia for quicker engine response
• Direct replacement for the factory flywheel
• Manufacturer Part Number: SC40A-2

Fits 2010-2013 Chevrolet Camaro LS and LT models.

The SPEC Stage 1 Clutch Kit (SC361-2) is engineered for street performance and spirited driving, providing a significant increase in torque capacity while retaining a smooth, OE-like engagement feel. This kit is the ideal upgrade for naturally aspirated or lightly modified V6 Camaros that require more holding power than a standard replacement clutch without the aggressive chatter associated with race-spec units.

The assembly features a high-clamp pressure plate and a steel-backed, woven organic friction material. This combination ensures consistent performance and durability for daily-driven vehicles and weekend enthusiasts alike.

• Manufacturer Part Number: SC361-2
• Series: Stage 1 Performance
• Friction Material: Woven Organic
• Application: Street, Autocross, and Light Track use
• Direct bolt-on replacement for factory clutch assembly

Fits 1997-2006 Chevrolet Corvette (Base, Z06, 50th Anniversary), 1998-2002 Camaro Z28, 1998-2002 Firebird Formula, and 2004-2006 Pontiac GTO.

The SPEC Stage 3 Clutch Kit (SC093) is a high-performance drivetrain upgrade engineered for drivers requiring significantly increased torque capacity and more aggressive engagement than a standard replacement. This kit is designed to handle the rigorous demands of high-horsepower street and track applications while maintaining the geometry required for a direct installation into the factory bellhousing.

• High-clamp pressure plate for increased holding capacity
• Performance-grade clutch disc designed for high-heat durability
• Direct-fit replacement for original equipment components
• Manufacturer Part Number: SC093

Fits 2013-2019 BMW M2, M3, and M4 models equipped with the S55 engine.

The SPEC SS-Trim Twin Disc Clutch Kit is designed for high-output BMW S55 builds that require extreme torque capacity without sacrificing the engagement quality needed for street use. By utilizing a multi-disc design, this kit significantly increases the effective friction surface area, allowing it to manage high horsepower and torque loads while maintaining a manageable pedal effort and smooth take-off characteristics.

• SS-Trim series optimized for high-performance street and track duty
• Multi-disc configuration for maximum torque holding and superior heat management
• Precision-engineered for the BMW S55 drivetrain
• Includes all necessary components for a comprehensive clutch upgrade
• Manufacturer Part Number: SB55SST-8.5

Designed for the 2012-2017 BMW 335i (F30), the SPEC Clutch Billet Steel Flywheel (SB55S-2) offers a significant performance upgrade over the heavy factory dual-mass unit. This high-mass steel flywheel is engineered for street and track applications where maintaining rotational inertia is preferred for driveability while improving overall throttle response and durability.

Manufactured from high-carbon billet steel, this flywheel is CNC-machined to precise tolerances to ensure perfect balance and consistent clutch engagement. It is an ideal choice for high-torque engines that require a stronger, more reliable friction surface than the stock component can provide.

• Fits 2012-2017 BMW 335i (F30)
• Constructed from high-tensile billet steel for superior strength
• Precision balanced to reduce vibration and drivetrain wear
• Durable friction surface compatible with various clutch disc materials
• Direct replacement for the original flywheel
• Manufacturer Part Number: SB55S-2

Fits 2012-2016 BMW 335i (F30).

The SPEC Stage 2+ Clutch Kit is a performance upgrade designed for vehicles requiring increased torque capacity without sacrificing street drivability. This kit features a hybrid multi-friction disc that utilizes a carbon-graphite semi-metallic material on one side and a high-performance Kevlar on the other. This unique configuration provides a higher friction coefficient than the Stage 2 kit while maintaining the smooth engagement characteristics essential for daily driving.

• Manufacturer Part Number: SB553H-2
• High-clamp pressure plate for improved holding power
• Hybrid multi-friction disc for optimal torque transfer
• Includes necessary bearings and alignment tool (where applicable)
• Designed for modified street cars and spirited driving
• Direct replacement for the factory clutch assembly

Fits 2009-2012 BMW 1 Series M, 135i, 335i, and 535i / 535i xDrive (3.0L).

This SPEC steel flywheel is a high-performance replacement for the factory unit in 6-bolt crankshaft applications. Engineered from billet carbon steel, it significantly reduces rotational mass compared to the original dual-mass flywheel. This reduction improves throttle response and acceleration while maintaining the heat-sink capacity required for street and track durability. It is an ideal solution for drivers seeking a more connected drivetrain feel without the excessive chatter often associated with lighter aluminum options.

• Crankshaft Mounting: 6-Bolt pattern
• Material: High-strength billet carbon steel
• Compatibility: Designed for select BMW 3.0L engines
• Manufacturer Part Number: SB53S-3

Vehicle Fitment

Fits select 2007-2012 BMW 135i, 335i, 335is, and 535i models equipped with the 3.0L engine.

This SPEC billet steel flywheel (SB53S-2) is engineered as a high-performance alternative to the factory dual-mass unit. Designed for drivers who demand better throttle response and increased durability, this flywheel is CNC-machined from high-carbon billet steel to exacting tolerances. The 8-bolt mounting pattern ensures a precise fit to the crankshaft flange, providing a stable foundation for your clutch assembly in high-torque applications.

• Manufacturer Part Number: SB53S-2
• Material: High-carbon billet steel
• Engine Compatibility: 3.0L (N54/N55)
• Crankshaft Mounting: 8-Bolt pattern
• Replaceable friction surface for extended service life
• Exceeds SFI safety standards for high-RPM use

Fits select 2007-2009 BMW 135i, 335i, 335xi, 535i, and 535xi models. This SPEC SB53A-2 aluminum flywheel is precision-machined for high-performance applications that demand reduced rotational mass and improved engine response.

Important Note: This flywheel is engineered exclusively for use with SPEC SB53x-2 series clutch kits. It is not compatible with standard OE clutches or other SPEC clutch series. By replacing the heavy factory dual-mass flywheel with this lightweight aluminum alternative, you enable faster revving and more efficient power delivery to the drivetrain.

• Manufacturer Part Number: SB53A-2
• Material: High-grade lightweight aluminum
• System Requirement: Must be used with SPEC SB53x-2 series clutch kits
• Benefit: Reduces rotational inertia for improved throttle response and acceleration
• Design: Replaces factory dual-mass flywheel in performance-tuned applications

Fits select 2007-2009 BMW 135i, 335i, and 535i models equipped with the N54 engine.

The SPEC Stage 2+ Clutch Kit (SB533H-2) is engineered for high-performance street and occasional track use, offering a significant increase in torque capacity over the Stage 2 unit without sacrificing the drivability required for a daily driver. This hybrid design utilizes a multi-friction disc to provide smooth engagement while maintaining the clamping force necessary for modified engines. This kit is designed for vehicles requiring a robust drivetrain solution that can handle increased boost levels and power output.

Important Installation Note: This clutch kit is designed exclusively for use with the SPEC SB53A-2 flywheel; it will not bolt to the factory dual-mass flywheel.

• Manufacturer Part Number: SB533H-2
• Clutch Series: Stage 2+
• Torque Capacity: Higher rating than Stage 2 while maintaining streetable engagement
• Compatibility: Requires SPEC SB53A-2 flywheel for proper fitment and operation
• Included Components: High-clamp pressure plate and multi-friction clutch disc

Fits select 2007-2009 BMW 135i, 335i, and 535i (including xDrive and xi models).

The SPEC Stage 2+ Clutch Kit (SB533H) is a high-performance upgrade designed for enthusiast drivers who need increased torque capacity without sacrificing streetable engagement. This kit bridges the gap between full street and track-oriented setups, providing a multi-friction disc surface that offers a higher load capacity while maintaining smooth take-off characteristics. It is an ideal solution for vehicles with bolt-on modifications that have exceeded the limits of the factory clutch.

• Manufacturer Part Number: SB533H
• Series: Stage 2+
• Fitment Type: Direct replacement for OE flywheel
• Torque Capacity: Increased over Stage 2 and factory specifications
• Recommended Use: High-performance street and occasional track use

Fits 2007-2010 BMW 135i and 335i models.

The SPEC Stage 3+ Clutch Kit (SB533F-2) is the ultimate high-performance street and track solution for the N54 platform. This flagship kit offers the high torque capacity of a ceramic race unit while maintaining the smooth engagement and drivability of a full-face disc. It is designed specifically for vehicles with significant power upgrades that still see regular street use.

The Stage 3+ features a carbon-graphite semi-metallic friction material and a high-clamp pressure plate to manage increased torque loads without the aggressive "on/off" chatter common in puck-style clutches. Note: This clutch kit must be paired with the SPEC SB53A-2 flywheel for proper installation and operation.

• High-torque capacity full-face clutch disc
• Carbon-graphite semi-metallic friction surface
• Heavy-duty high-clamp pressure plate
• Includes release bearing and alignment tool
• Manufacturer Part Number: SB533F-2
• Requires SPEC SB53A-2 Flywheel (sold separately)

Fits select 2007-2009 BMW 135i, 335i, and 535i (Base, xDrive, and xi models).

The SPEC Stage 3+ Clutch Kit (SB533F) is the flagship high-performance street and track solution for the BMW N54 platform. This kit features a unique full-faced carbon-graphite semi-metallic friction material that provides a significantly higher torque capacity than the Stage 3, while maintaining the smooth engagement characteristics of a full-faced disc. It is designed to handle the increased output of modified twin-turbocharged engines without the chatter or abrupt engagement typically associated with puck-style racing clutches.

• Manufacturer Part Number: SB533F
• High-clamp pressure plate for increased torque capacity
• Full-faced carbon-graphite friction material for heat resistance and durability
• High-torque sprung hub to protect drivetrain components and reduce NVH
• Suitable for street, drag, and road racing applications
• Direct replacement for the factory clutch assembly

Fits 2007-2010 BMW 135i and 335i.

The SPEC Stage 3 Clutch Kit (SB533-2) is engineered for high-performance applications, providing a significant increase in torque capacity for modified N54 engines. This kit is designed to handle the thermal loads and increased output of spirited street driving and track use while maintaining consistent engagement characteristics.

• High-performance Stage 3 pressure plate and disc assembly
• Enhanced torque capacity for tuned street and track vehicles
• Includes necessary hardware for installation
• Manufacturer Part Number: SB533-2
• Note: This clutch kit is designed specifically for use with the SPEC SB53A-2 flywheel and is not compatible with the factory dual-mass flywheel.