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Performance Clutch
Our integrated clutch and flywheel packages increase transmission efficiency and engine response. Our clutches and flywheels are built within strict tolerances and crafted using carefully selected materials to provide the highest quality and durability.

Limited Slip Differential
The OS Super Lock LSD is the culmination of over four years of extensive research and development that led to a revolutionary LSD design with the capacity to house an unprecedented number of friction plates (up to 28 plates in total). Combined with our patented lock timing system, the Super Lock LSD is able to achieve complete lock in a progressive, smooth, and quiet manner, making it suitable for both street and racing performance.

Close Ratio Gear Kit
OS Giken Close Ratio Gear Kits are developed for those seeking improved drive train reliability and faster lap times. Gear ratios are carefully calculated for each vehicle application for the sole intention to maximize your engine’s potential. Each OS gear component has been carefully designed and created using high-quality forged materials resulting in extra strength and durability.

Special Parts
Our extensive racing experience matched with our technical manufacturing knowledge, has led to the development of a wide assortment of custom and limited parts to meet the rigorous demands of the ambitious racing world. Throughout the years, these parts have become highly sought after, so we now include them in our product line-up