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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. 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.
Topseller
OS Giken Honda Civic EK4(9) DC2 B18/16A 3-Speed Close Ratio Gear Kit (3.077/1.600/1.261) OS Giken Honda Civic EK4(9) DC2 B18/16A 3-Speed Close Ratio Gear Kit (3.077/1.600/1.261)
  • Artikel-Nr.: HA031-GA
    • 1.751,68 € *
    Zum Produkt
    OS Giken Mini Cooper S R56 1.6L 6MT STR Series 215mm Solid Soft Release Sleeve Assy. & FW Bolts OS Giken Mini Cooper S R56 1.6L 6MT STR Series 215mm Solid Soft Release Sleeve Assy. & FW Bolts
  • Artikel-Nr.: MN023-BJ5
    • 2.553,74 € *
    Zum Produkt
    OS Giken 13-15 Scion FR-S Clutch GTS1CD Dempened Includes Release Sleeve and Flywheel OS Giken 13-15 Scion FR-S Clutch GTS1CD Dempened Includes Release Sleeve and Flywheel
  • Artikel-Nr.: TY421-AR6
    • 1.969,45 € *
    Zum Produkt
    OS Giken Toyota Supra JZA70 - 1JZGTE R154 Release Movement Alteration Kit OS Giken Toyota Supra JZA70 - 1JZGTE R154 Release Movement Alteration Kit
  • Artikel-Nr.: TY021-ALT25
    • 585,48 € *
    Zum Produkt
    OS Giken Clutch Overhall Kit B for R3C OS Giken Clutch Overhall Kit B for R3C
  • Artikel-Nr.: OS021-CH50B
    • 2.178,89 € *
    Zum Produkt
    OS Giken Mitsubishi LANCER EVO 4-9 4G63 Release Movement Alteration Kit OS Giken Mitsubishi LANCER EVO 4-9 4G63 Release Movement Alteration Kit
  • Artikel-Nr.: MT031-ALT
    • 585,48 € *
    Zum Produkt
    OS Giken Replacement Main Shaft for Assembly Kit NS052-GS OS Giken Replacement Main Shaft for Assembly Kit NS052-GS
  • Artikel-Nr.: NS052-GT
    • 1.403,01 € *
    Zum Produkt
    OS Giken Nissan 22mm (Push Type) Release Sleeve Assembly Set OS Giken Nissan 22mm (Push Type) Release Sleeve Assembly Set
  • Artikel-Nr.: NS001-022K
    • 161,84 € *
    Zum Produkt
    OS Giken Nissan 350Z/370Z VQ35/37HR Alteration Fork Conversion Kit OS Giken Nissan 350Z/370Z VQ35/37HR Alteration Fork Conversion Kit
  • Artikel-Nr.: NS112-ALT1M
    • 659,26 € *
    Zum Produkt
    OS Giken Mitsubishi Evo X Clutch Release Movement Alteration Kit OS Giken Mitsubishi Evo X Clutch Release Movement Alteration Kit
  • Artikel-Nr.: MT071-ALT
    • 585,48 € *
    Zum Produkt
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    OS Giken Honda Civic EK4(9) DC2 B18/16A 3-Speed Close Ratio Gear Kit (3.077/1.600/1.261)
    OS Giken Honda Civic EK4(9) DC2 B18/16A 3-Speed Close Ratio Gear Kit (3.077/1.600/1.261)
    3-Speed Close Ratio Gear Kit 1st: 3.077 2nd: --- 3rd: 1.600 4th: 1.261
  • Artikel-Nr.: HA031-GA
    • 1.751,68 € *
    Zum Produkt
    OS Giken Mini Cooper S R56 1.6L 6MT STR Series 215mm Solid Soft Release Sleeve Assy. & FW Bolts
    OS Giken Mini Cooper S R56 1.6L 6MT STR Series 215mm Solid Soft Release Sleeve Assy. & FW Bolts
    STR Series Clutch; Aluminum Cover Twin Plate w/Soft Diaphragm; Release Sleeve Assembly Included
  • Artikel-Nr.: MN023-BJ5
    • 2.553,74 € *
    Zum Produkt
    OS Giken 13-15 Scion FR-S Clutch GTS1CD Dempened Includes Release Sleeve and Flywheel
    OS Giken 13-15 Scion FR-S Clutch GTS1CD Dempened Includes Release Sleeve and Flywheel
    STR Series Clutch; Aluminum Cover Dampened Single Plate w/Soft Diaphragm; Release Sleeve Assembly & Flywheel Included
  • Artikel-Nr.: TY421-AR6
    • 1.969,45 € *
    Zum Produkt
    OS Giken Toyota Supra JZA70 - 1JZGTE R154 Release Movement Alteration Kit
    OS Giken Toyota Supra JZA70 - 1JZGTE R154 Release Movement Alteration Kit
    Movement Alteration Kit
  • Artikel-Nr.: TY021-ALT25
    • 585,48 € *
    Zum Produkt
    OS Giken Clutch Overhall Kit B for R3C
    OS Giken Clutch Overhall Kit B for R3C
    OS Giken Clutch Overhall Kit B for R3C
  • Artikel-Nr.: OS021-CH50B
    • 2.178,89 € *
    Zum Produkt
    OS Giken Mitsubishi LANCER EVO 4-9 4G63 Release Movement Alteration Kit
    OS Giken Mitsubishi LANCER EVO 4-9 4G63 Release Movement Alteration Kit
    Movement Alteration Kit
  • Artikel-Nr.: MT031-ALT
    • 585,48 € *
    Zum Produkt
    OS Giken Replacement Main Shaft for Assembly Kit NS052-GS
    OS Giken Replacement Main Shaft for Assembly Kit NS052-GS
    Reinforced Main Shaft; For 5 Speed Kit
  • Artikel-Nr.: NS052-GT
    • 1.403,01 € *
    Zum Produkt
    OS Giken Nissan 22mm (Push Type) Release Sleeve Assembly Set
    OS Giken Nissan 22mm (Push Type) Release Sleeve Assembly Set
    Clutch Release Sleeve Assembly Size: 22mm
  • Artikel-Nr.: NS001-022K
    • 161,84 € *
    Zum Produkt
    OS Giken Nissan 350Z/370Z VQ35/37HR Alteration Fork Conversion Kit
    OS Giken Nissan 350Z/370Z VQ35/37HR Alteration Fork Conversion Kit
    Clutch Alteration Fork Conversion Kit; Requires OEM Nissan Parts
  • Artikel-Nr.: NS112-ALT1M
    • 659,26 € *
    Zum Produkt
    OS Giken Mitsubishi Evo X Clutch Release Movement Alteration Kit
    OS Giken Mitsubishi Evo X Clutch Release Movement Alteration Kit
    Movement Alteration Kit
  • Artikel-Nr.: MT071-ALT
    • 585,48 € *
    Zum Produkt
    OS Giken Porsche Boxster S (1st Gen) G50 Type Super Lock LSD
    OS Giken Porsche Boxster S (1st Gen) G50 Type Super Lock LSD
    Super Lock LSD; Spec-S
  • Artikel-Nr.: PR133-HA
    • 2.525,18 € *
    Zum Produkt
    OS Giken Nissan Silvia (S14) 3-Speed Close Ratio Gear Kit 2.717/1.722/1.232
    OS Giken Nissan Silvia (S14) 3-Speed Close Ratio Gear Kit 2.717/1.722/1.232
    3-Speed Close Ratio Gear Kit; w/ Reinforced Main Shaft 1st: 2.717 2nd: 1.722 3rd: 1.232
  • Artikel-Nr.: NS052-GR
    • 3.057,11 € *
    Zum Produkt
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