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HKS specializes in aftermarket high-performance auto parts engineering and manufacturing. It is one of the most well-known aftermarket brands in the world. Formed in 1973, and named after founders Hasegawa, Kitagawa, and Sigma, HKS began with a vision to tune and manufacture high-performance engine components and turbo kits that surpasses OE manufacturers. HKS introduced the world’s first turbo kit for the SKYLINE (GC100) L20 engine in 1974. It had improvements of 40% over the stock power numbers. In the time since, it has become an industry leader in turbo kit design and performance.

While its roots are in turbocharger systems, the company currently manufactures high-quality products for various areas of vehicle modification including suspension, tuning, exhaust, and supercharger kits.