Fits select 2007-2017 Nissan 350Z, 370Z, Infiniti G35, and G37 models (VQ35HR).

The OS Giken TR Series Dampened Twin Plate Clutch (NS112-BF6) is engineered for high-performance street builds that require significantly higher torque capacity than a single-plate unit without sacrificing drivability. By utilizing a dampened hub design, this TR Series clutch minimizes the characteristic drivetrain chatter and gear rattle often associated with multi-plate systems, making it an ideal choice for forced induction or high-revving naturally aspirated VQ engines. The twin-plate configuration provides a massive increase in surface area for heat dissipation and grip while maintaining a manageable pedal feel for daily use.

• Manufacturer Part Number: NS112-BF6
• Series: TR (Grand Touring)
• Disc Configuration: Twin Plate
• Hub Style: Dampened for reduced vibration and drivetrain noise
• Includes specialized flywheel and pressure plate assembly
• Optimized for street and spirited driving applications

Fits Honda Civic Type R (FK8).

The OS Giken HTR Series Twin Plate Clutch is engineered to handle the increased power demands of modified Honda Civic Type R FK8 platforms. By utilizing a twin-plate design, this assembly significantly increases the surface area for torque transfer and improves heat dissipation compared to the factory single-plate unit. The HTR Series is specifically tuned to provide a balance between high clamping force for the track and the smooth engagement required for spirited street driving.

• Twin-plate configuration for superior torque capacity and thermal management
• HTR Series tuning offers refined pedal feel and predictable engagement
• Designed to withstand high-RPM shifts and aggressive driving cycles
• Precision-machined components for long-term durability and reliability
• Complete clutch assembly designed for the FK8 K20C1 powertrain

OS Giken 80W-250 gear oil is a high-viscosity synthetic lubricant specifically engineered for high-load drivetrains and mechanical limited-slip differentials (LSD). This specialized formula provides an exceptionally strong oil film that maintains its integrity under the extreme pressures and temperatures encountered in competitive racing and heavy-duty track use.

This fluid is designed to optimize the performance of clutch-type differentials, ensuring smooth plate engagement while significantly reducing mechanical chatter. By minimizing friction and heat buildup, it helps extend the service life of internal components and ensures consistent torque transfer across the axles.

• Viscosity Grade: 80W-250
• Volume: 1 Liter
• Composition: Full Synthetic
• Application: Mechanical LSDs and high-load manual transmissions
• Optimized for thermal stability and shear resistance

Fits 2007-2011 Subaru Impreza WRX STI, WRX STI Limited, and WRX STI Special Edition.

The OS Giken Super Lock LSD is a premier mechanical limited-slip differential designed to maximize traction and power delivery for the GDB Subaru Impreza STI. This rear differential unit solves the issues of inconsistent wheel spin and power loss common with factory units. By utilizing a high-capacity pressure plate system, the Super Lock LSD provides smooth, progressive locking that improves stability during hard cornering and ensures both rear tires are working to propel the vehicle forward.

• Patented OS Giken Super Lock mechanical design for superior grip
• Specific fitment for GDB chassis Subaru WRX STI rear housings
• Improves corner exit speeds and high-torque launch consistency
• Precision-engineered internals for high-performance durability
• Direct replacement for the factory rear limited-slip differential

Fits select 1975-1989 Datsun 280Z, 280ZX, and Nissan 300ZX models equipped with the Long Nose R200 differential.

The OS Giken Super Lock LSD is a premier clutch-type limited-slip differential designed to transform the handling and traction of your classic Z-car. Unlike standard gear-type or viscous units, the Super Lock system uses a progressive locking mechanism that allows for smooth, predictable engagement while providing maximum lock under high-load conditions. This eliminates unwanted wheel spin and ensures power is delivered effectively to the pavement during corner exit and straight-line acceleration.

• Precision-machined internal components for maximum durability and consistent performance
• Customizable lock timing and pressure to suit specific street or track setups
• Progressive clutch engagement reduces chatter and mechanical noise
• Specifically engineered for the Long Nose R200 housing found in Datsun 280Z/280ZX and early 300ZX chassis
• Replaces the factory open differential or worn OEM limited-slip units

Fits 2016-2020 Mazda MX-5 Miata ND models including Club, Grand Touring, Sport, and RF variants (2.0L).

Upgrade your ND Miata drivetrain with the OS Giken Limited Slip Differential (MPN: MZ191-HA). Engineered to provide superior traction and stability, this LSD replaces the factory differential unit to deliver more consistent power to the ground. Whether on the street or at the track, the OS Giken LSD minimizes wheel spin and improves corner-exit acceleration by efficiently distributing torque between the rear wheels.

• Manufacturer Part Number: MZ191-HA
• Direct fit for 2.0L Mazda MX-5 Miata (2016-2020)
• Precision-machined internal components for maximum durability
• Enhances vehicle control and predictability under high-performance driving conditions
• Engineered for smooth engagement and quiet operation

Fits select 1988-2013 BMW M3, M5, M6, Z4 M Coupe, and 740i/740iL/750iL models. The OS Giken Super Lock LSD (BM237-HA) is a high-performance 1.5-way mechanical limited-slip differential engineered to deliver progressive, predictable traction under any driving condition.

Unlike traditional clutch-type differentials, the Super Lock design utilizes a patented pressure ring and an increased number of friction plates. This allows for near 100% lock-up performance when torque is applied, without the chattering or harsh engagement typically found in race-spec units. For the enthusiast, this means superior corner-exit stability and more efficient power delivery to the ground.

• Increased Plate Capacity: Houses more friction plates than standard units for maximum torque transfer.
• Progressive Locking: Patented design ensures smooth transition from open to locked, reducing tire wear and drivetrain shock.
• Forged Steel Housing: High-strength construction ensures long-term durability in high-torque BMW applications.
• Maintenance-Friendly: Designed for reliability with high-quality internal components that resist heat and wear.
• MPN: BM237-HA

Fits select 2003-2017 Nissan 350Z, 370Z and Infiniti G35, G37 models equipped with manual transmissions.

The OS Giken Super Lock LSD (Limited Slip Differential) is engineered to provide superior traction and stability for high-performance driving. Designed specifically for the Z-chassis and G-series manual transmission drivelines, this differential replaces the factory unit to offer more predictable handling under both acceleration and cornering. The Super Lock design allows for a high degree of locking force while maintaining smooth, progressive engagement, making it a critical upgrade for both street performance and dedicated track use.

• Manufacturer Part Number: NS111-HA
• Transmission Compatibility: Manual Transmission (MT) Only
• Engine Compatibility: VQ35DE, VQ35HR, VQ37VHR (as per vehicle fitment)
• High-capacity friction plate design for maximum durability and locking force
• Improves power delivery and cornering exit speeds by reducing inner-wheel spin
• Engineered for precise fitment within the factory rear differential housing

Fits 2005-2012 Porsche Boxster and 2006-2012 Cayman models equipped with manual transmissions.

The OS Giken Super Lock LSD (PR151-HA) is a high-performance clutch-type limited-slip differential engineered for drivers who demand predictable traction on both the street and the track. Unlike standard LSDs that can exhibit jerky engagement, the Super Lock design uses a specialized pressure ring and a high count of friction plates to provide progressive, smooth locking that scales with torque input. This results in superior cornering stability and reduced inside-wheel spin without compromising drivability.

• Manufacturer Part Number: PR151-HA
• Transmission Compatibility: Manual Transmission (MT) Only
• Internal Design: Progressive clutch-type with high friction plate capacity
• Locking Characteristic: Speed and torque sensitive for smooth engagement
• Housing: High-strength steel construction for maximum durability

Full Fitment List:

• 2005-2012 Porsche Boxster (Base, S, Spyder, Limited Edition, Black Edition)
• 2006-2012 Porsche Cayman (Base, S, R)

Fits 2013-2017 Toyota 86, Subaru BRZ, and Scion FR-S models.

The OS Giken Super Lock LSD (TY421-HA) is a high-performance mechanical limited-slip differential engineered for maximum traction and predictable handling. Unlike traditional LSDs that use high initial torque, the Super Lock design utilizes a high number of friction plates to ensure smooth, progressive engagement while providing a complete lock-up under load. This design minimizes chatter and provides superior cornering stability, whether you are on the street or at the track.

• High-capacity friction plate design for smooth, total lock-up
• Improves corner exit speeds and overall vehicle control
• Precision-engineered for durability under high-stress conditions
• Retains street-friendly drivability with minimal noise and vibration
• Direct replacement for the factory differential unit
• Manufacturer Part Number: TY421-HA

Fits 2000-2004 Honda S2000 Base and 2004-2005 Mazda Miata Mazdaspeed (Manual Transmission only).

The OS Giken Super Lock LSD (Limited Slip Differential) is engineered to provide maximum traction and predictable handling for high-performance driving. Unlike standard clutch-type differentials that can be binary or harsh in their engagement, the Super Lock system uses a progressive locking mechanism that transitions smoothly from open to fully locked. This design reduces wheel spin during cornering and significantly improves stability under hard acceleration and braking.

Constructed with a high number of internal friction plates, this LSD offers superior durability and heat dissipation compared to OEM units. It is a direct internal replacement designed to withstand the rigors of track use and spirited street driving while maintaining quiet operation.

• Manufacturer Part Number: HA091-HA
• Transmission Compatibility: Manual Transmission (MT) Only
• Locking Design: OS Giken Super Lock progressive engagement
• Increased friction plate count for enhanced torque capacity and longevity
• Improves corner exit speeds and overall vehicle control

Fits 2002-2004 Acura RSX (Base/Type-S) and 2002-2003 Honda Civic Si equipped with manual transmissions.

The OS Giken Super Lock Limited Slip Differential (LSD) is a high-performance mechanical differential designed to provide superior traction and stability. Unlike conventional LSDs that can be abrupt or unpredictable, the Super Lock uses a proprietary pressure ring design that allows for a higher number of friction plates and progressive locking. This results in smoother engagement during cornering and maximum power delivery to the ground under acceleration.

Built to handle the high-revving nature of the K20A engine series, this unit (HA081-HA) significantly improves lap times and street drivability by minimizing wheel spin and maximizing grip. Its durable construction ensures consistent performance even under heavy track use, making it an essential upgrade for any performance-oriented DC5 or EP3 build.

• Fits 2002-2004 Acura RSX and 2002-2003 Honda Civic Si
• Compatible with Manual Transmission (MT) models only
• Innovative Super Lock design for progressive, predictable locking
• High-capacity friction plate configuration for reduced heat and wear
• Direct replacement for the factory open or helical differential
• Manufacturer Part Number: HA081-HA

The OS Giken Limited Slip Differential (LSD) provides superior traction and mechanical grip for vehicles equipped with Ford 8.8-inch rear ends and 31-spline axles. Designed to replace standard open differentials or less efficient factory limited-slip units, this differential ensures consistent power delivery to both drive wheels, significantly improving performance during cornering and high-torque acceleration.

This unit features the 25/35-336-10-10s (4-D) internal configuration, utilizing a high-friction clutch-based design to manage locking characteristics with precision. The result is a predictable and smooth engagement that reduces wheel spin without the harshness often found in lesser aftermarket differentials.

• Manufacturer Part Number: FD881-HA
• Differential Type: Ford 8.8-inch
• Spline Count: 31 Spline
• Configuration Code: 25/35-336-10-10s (4-D)
• High-grade internal components for durability under load
• Engineered for precise torque distribution and vehicle stability

Fits 1993-1998 Toyota Supra Twin Turbo (JZA80) and Soarer (JZZ30) models equipped with 8.5-inch differentials.

The OS Giken Super Lock LSD (TY031-HA) represents a significant advancement in drivetrain technology, engineered to provide 100% locking capability without the harshness or chatter associated with traditional plate-style differentials. This limited-slip differential uses a patented pressure ring design that allows for progressive engagement, ensuring maximum traction during high-speed cornering and straight-line acceleration while maintaining smooth operation during low-speed maneuvers.

• Manufacturer Part Number: TY031-HA
• Compatible with 8.5-inch differential housings
• Suitable for 5-speed manual, 6-speed manual, and automatic transmissions
• Internal pressure ring design for progressive, predictable locking
• Precision-manufactured friction plates for increased durability and heat capacity
• Replaces factory open or Torsen-style differentials

Engineered for high-performance applications, the OS Giken TR Series Dampened Twin Plate Clutch provides the Toyota Supra (1JZ-GTE) with superior torque capacity and drivetrain protection. The TR (Technical Racing) series utilizes a dampened hub design to minimize gear rattle and shock loads, making it an ideal choice for high-horsepower street and track builds that require refined engagement without sacrificing clamping force.

• Fits Toyota Supra models equipped with the 1JZ-GTE engine.
• Dampened hub design reduces drivetrain vibration and protects the transmission.
• Twin-plate configuration significantly increases torque capacity over single-plate units.
• Technical Racing (TR) series optimized for heat dissipation and consistent pedal feel.
• Manufacturer Part Number: TY021-BF6
• Required Component: Must be used with OS Giken installation part TY021-ALT25.

By utilizing a smaller diameter clutch disc and a lightweight flywheel, this assembly reduces rotational inertia for faster throttle response and smoother high-RPM shifting. This kit is a direct evolution of OS Giken’s racing heritage, adapted for the demands of the 1JZ-GTE platform.

Fits 1989-1998 Nissan Skyline GT-R and GTS models (R32/R33).

The OS Giken TS Series Twin Plate Clutch (TS2CD) is engineered for high-performance street and track applications. This assembly provides a significant increase in torque capacity over the factory unit while maintaining a manageable pedal feel, making it an ideal choice for modified RB-series engines. By utilizing two smaller-diameter friction plates, the TS series reduces rotational inertia for faster throttle response and smoother shifting under high-load conditions.

• Manufacturer Part Number: NS201-BC6
• Series: TS Twin Plate
• Chassis Fitment: Nissan Skyline R32 and R33 (GT-R/GTS)
• Includes: Pressure plate and clutch discs
• Required Hardware: Must use part number NS201-BC60M or a specific OS Giken Throw Out Bearing (TOB) for installation.

Fits select 2007-2017 Nissan 350Z, 370Z and Infiniti G35, G37 models (VQ35HR/VQ37 engines) equipped with manual transmissions.

The OS Giken Super Lock LSD is a precision-engineered mechanical limited-slip differential designed to solve the traction limitations of factory-equipped units. Unlike standard viscous or open differentials, the Super Lock design uses a high number of friction plates to provide progressive and predictable locking engagement. This ensures that power is distributed effectively to both drive wheels, significantly improving corner-exit speed and high-speed stability.

• Manufacturer Part Number: NS112-HA
• Series: Super Lock LSD
• Transmission Compatibility: Manual Transmission (MT) Only
• Housing: High-strength steel construction for maximum durability
• Performance: Fully tunable locking characteristics for street or track use

By utilizing a unique pressure ring design, this LSD minimizes chatter and heat buildup while providing a smooth transition between open and locked states. It is a direct replacement for the factory differential unit in supported VQ-series manual transmission housings.

Fits 1991-1998 Nissan 240SX Base, LE, and SE models equipped with the KA24DE engine and manual transmission.

The OS Giken Super Lock LSD is a precision-engineered mechanical limited-slip differential designed to provide smooth, progressive engagement and maximum traction for the S13 and S14 chassis. Unlike standard clutch-type differentials that can be noisy or harsh, the Super Lock design uses a unique internal pressure ring mechanism that allows for 100% lock-up under load while remaining quiet during low-speed maneuvers. This improves corner-exit speeds and predictable handling by eliminating sudden wheel spin.

• Manufacturer Part Number: NS046-HA
• Fits: 1991-1998 Nissan 240SX (S13/S14)
• Transmission Compatibility: Manual Transmission (MT) only
• Engine: KA24DE
• Internal components are precision-machined and heat-treated for high-torque durability
• Provides progressive locking up to 100% for superior power delivery

Fits 2016+ Mazda MX-5 Miata (ND) models.

The OS Giken Expanded Capacity Rear Differential Cover is engineered to enhance the reliability and performance of your ND Miata's drivetrain. By increasing the total gear oil volume, this cover provides superior thermal management, helping to stabilize oil temperatures during track sessions, autocross, or spirited street driving. This is particularly beneficial for vehicles equipped with high-performance limited-slip differentials that generate significant heat under load.

• Increased gear oil capacity for improved heat dissipation and thermal stability
• Helps prevent fluid breakdown and premature wear during high-load operation
• Robust construction designed to withstand the rigors of competition use
• Direct fitment for the Mazda ND rear differential housing
• Manufacturer Part Number: MZ191-HCR

Fits select 1987-2011 Mazda RX-7 and RX-8 models (13BT, FD3S, SE3P) equipped with manual transmissions.

The OS Giken Super Lock LSD (MZ101-HA) is a premium mechanical limited-slip differential engineered to solve the traction limitations of factory rotary drivetrains. By utilizing a high number of friction plates and a patented pressure-ring design, this unit provides smooth, progressive engagement that can reach 100% lock-up under load. This translates to significantly improved corner-exit speeds, more predictable mid-corner balance, and eliminated wheel-spin during hard acceleration.

• Designed specifically for manual transmission (MT) Mazda RX-7 (Turbo II/FD3S) and RX-8 applications.
• Superior friction plate count ensures maximum durability and better heat dissipation than standard units.
• Predictable performance replaces inconsistent factory viscous or Torsen differentials.
• Precision-machined internal components for quiet operation and long service life.
• Manufacturer Part Number: MZ101-HA

Fits 2006-2014 Mazda MX-5 Miata NC models equipped with manual transmissions. This high-performance mechanical limited-slip differential is engineered to transform the handling characteristics of the third-generation MX-5 by maximizing traction and stability under hard cornering and acceleration.

The OS Giken Super Lock LSD utilizes a progressive locking mechanism that allows for a smooth, predictable transition from open to locked states. Unlike traditional plate-style differentials that can be noisy or harsh, the Super Lock design accommodates more friction plates than standard units, allowing for lower preload settings while providing 100% lock-up when needed. This results in superior corner-exit speed and reduced wheel spin without sacrificing street drivability.

• Manufacturer Part Number: MZ091-HA
• Type: Mechanical Limited Slip Differential (LSD)
• Fitment: 2006-2014 Mazda MX-5 (NC) Manual Transmission only
• Internal Design: High-capacity friction plate configuration for 100% lock-up capability
• Benefits: Improved traction, reduced tire wear compared to harsh lockers, and enhanced cornering stability

Fits select 2006-2013 Mini Cooper, Cooper S, and John Cooper Works models (1.6L) with 6-speed manual transmissions.

The OS Giken STR Series clutch is engineered to bridge the gap between high-performance track capability and daily drivability. This 215mm single-plate clutch kit provides increased clamping force and torque capacity without the heavy pedal feel typically associated with racing clutches. The included "Soft" release sleeve assembly ensures smooth, predictable engagement, making it an ideal upgrade for modified street cars and weekend track vehicles.

Built to precise tolerances, this kit replaces the factory flywheel and clutch assembly with a lighter, more durable high-grade steel flywheel and a performance-matched clutch disc and pressure plate. It is designed to dissipate heat more effectively, preventing clutch fade during spirited driving or technical maneuvers.

• Manufacturer Part Number: MN023-BJ5
• Series: STR Series (Single Plate)
• Clutch Disc Diameter: 215mm
• Release Type: Includes Soft Release Sleeve Assembly
• Hardware: Flywheel (FW) bolts included
• Transmission Compatibility: 6-speed manual (6MT)

Fitment Applications: