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.