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Starting in the early 1960’s, Masaharu Okazaki set out on a mission to build high-performance Japanese race engines to compete with the championship-winning European offerings of the time. Armed only with a pure passion for motorsports and an innate ability to absorb information, he basically took things apart in his garage, figured out how they work, and designed improvements to increase performance. A self-educated man, he originally began working on motorcycles and eventually moved on to parts development for 4-wheel automobiles. Mr. Okazaki founded his company, OS Giken, in the early 1970’s with strength, durability, and the pursuit of high performance in mind; these goals for parts development remain true today and OS Giken has established itself in the upper-echelon for designing and manufacturing high quality, high performance, and supremely durable parts.

From Mr. Okazaki’s humble beginnings tinkering with motorcycle parts at home, OS Giken has evolved and grown over the years, building and cementing a reputation as one of the best racing drivetrain parts manufacturers in the world. Officially founded in 1973, the company headquarters and factory are located in Okayama, Japan. All OS Giken parts are 100% manufactured and assembled in Japan, under very strict quality-control guidelines. Production and design capabilities for engine and drivetrain components are OS Giken’s specialty, but the company has the ability to design and build just about anything mechanical. As the design, construction, and usage of the automobile evolves, OS Giken looks forward to the challenges presented to find room for improvement!

$1,050.00

OS Giken Super Single Clutch Kit Nissan Fairlady / 240Z S30 130Z L6 OS Gikens Super Single Clutch series is an ideal choice as a replacement to the original equipment clutch and flywheel and provides your vehicle with quicker response and higher performance. The Super Single Clutch is designed with the same high-quality materials and [...]

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$1,050.00

OS Giken Super Single Clutch Kit Infiniti G35 V35 VQ35DE:NEO OS Gikens Super Single Clutch series is an ideal choice as a replacement to the original equipment clutch and flywheel and provides your vehicle with quicker response and higher performance. The Super Single Clutch is designed with the same high-quality materials and strict manufacturing processes [...]

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$1,150.00

OS Giken Super Single Clutch Kit Infiniti G35 V35 VQ35DE:NEO OS Gikens Super Single Clutch series is an ideal choice as a replacement to the original equipment clutch and flywheel and provides your vehicle with quicker response and higher performance. The Super Single Clutch is designed with the same high-quality materials and strict manufacturing processes [...]

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$50.00

OS Giken Limited Slip Differential Fluid – 80w-250 – 1 liter SKU. 04GFD | Part No. OS011-KA1   LSD Gear Oil 1L Can Works for all OS Giken LSDs Quieter operation/better lock

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$1,520.00

SUPER LOCK LSD Superior Design Miniaturized pressure ring and a superior spline-through-side-gear design allows for fitment of more friction plates (up to 2x as many as competitors versions), offering true 100% lock capability. Patented pressure ring design allows for smooth, progressive locking. LSD case has a relief cut-out for the cone spring, resulting in minimal [...]

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$1,520.00

SUPER LOCK LSD Superior Design Miniaturized pressure ring and a superior spline-through-side-gear design allows for fitment of more friction plates (up to 2x as many as competitors versions), offering true 100% lock capability. Patented pressure ring design allows for smooth, progressive locking. LSD case has a relief cut-out for the cone spring, resulting in minimal [...]

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$1,720.00

OS Giken STR Twin Plate Clutch Nissan Fairlady / 350Z / 370Z Z33/Z34 VQ35HR VQ37VHRThe STR Clutch line-up is best suited for those who enjoy spirited driving and is well suited for street and occasional race use. The STR Clutch is available in single and twin plate configurations, and matched with a unique clutch cover [...]

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$1,520.00

SUPER LOCK LSD Superior Design Miniaturized pressure ring and a superior spline-through-side-gear design allows for fitment of more friction plates (up to 2x as many as competitors versions), offering true 100% lock capability. Patented pressure ring design allows for smooth, progressive locking. LSD case has a relief cut-out for the cone spring, resulting in minimal [...]

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$1,150.00

OS Giken Super Single Clutch Kit Nissan Fairlady / 240Z S30 130Z L6 OS Gikens Super Single Clutch series is an ideal choice as a replacement to the original equipment clutch and flywheel and provides your vehicle with quicker response and higher performance. The Super Single Clutch is designed with the same high-quality materials and [...]

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$1,720.00

OS Giken TR Twin Plate Clutch Kit Nissan Fairlady / 350Z / 370Z Z33/Z34 VQ35HR VQ37VHR The TR Clutch lineup is designed for vehicles which have substantial increases in engine power and will be used mostly for racing with mild street use. The billet aluminum cover provides a more direct clutch pedal feel, but still [...]

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$1,610.00

OS Giken TS Twin Plate Clutch Kit Nissan Fairlady / 350Z / 370Z Z33/Z34 VQ35HR VQ37VHRThe TS Clutch line-up is for vehicles with moderate increases in engine power which will be used for daily street driving as well as frequent racing. The stamped steel cover maintains a reduced pedal effort, while the heat-treated alloy clutch [...]

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