Holley is a company that designs, manufactures, and distributes high-performance automotive aftermarket products. It offers carburetors, fuel pumps, fuel injection systems, nitrous oxide injection systems, superchargers, exhaust headers, mufflers, distributors, ignition components, engine tuners, etc. The company also provides exhaust products as well as shifters, converters, transmission kits, transmissions, tuners, and automotive software.