Holley Inc. designs, manufactures, and markets automotive aftermarket products for car and truck enthusiasts in the United States, Canada, Europe, and China. The company's products include carburetors, fuel pumps, fuel injection systems, nitrous oxide injection systems, superchargers, exhaust headers, mufflers, distributors, ignition components, engine tuners, automotive performance plumbing products, and exhaust products as well as shifters, converters, transmission kits, transmissions, tuners, and automotive software. It also offers wheels, chassis and suspension products, helmets, head and neck restraints, seat belts, firesuits, and electronic control and monitoring systems.