HKS Co., Ltd. manufactures and sells automobile aftermarket parts in Japan and internationally. It offers turbo kits, exhaust systems, turbochargers, original mufflers, suspensions, electronic parts, NGV parts, and others; race engines; eco-friendly and fuel efficient systems; and conversion kits for converting a gasoline vehicle into compressed natural gas and gasoline Bi-fuel vehicle. The company also engages in developing and selling light sport aircraft engines, as well as the contract and original equipment manufacturing business. HKS Co., Ltd. was founded in 1973 and is headquartered in Fujinomiya, Japan.