In 1975, OS Giken made its memorable entry into the racing world with its unparalleled 4 valve DOHC TC16-MAII/TC24-B1 engine, and firmly established itself as one of the most innovative race engineering companies in Japan.

OS Giken constantly strives to advance race technology through our pursuit of producing true racing-spec parts for all vehicle components from the engine down to the road surface.

Because all designs and concepts of OS Giken are based on sound engineering and quality manufacturing, their reputation for reliable performance and durability is unparalleled.

We offer performance items from clutches to close ratio gear kits for most of today's leading car manufactures.