Holley Inc. designs, manufactures, and distributes automotive aftermarket products for car and truck enthusiasts in the United States, Canada, and Europe. Its performance products include carburetors, fuel pumps, fuel injection systems, nitrous oxide injection systems, superchargers, exhaust headers, mufflers, distributors, ignition components, engine tuners, and automotive performance plumbing products, as well as exhaust products, shifters, converters, transmission kits, transmissions, tuners, and automotive software. The company sells under brands such as Holley EFI, Holley, MSD, Simpson, EDGE, Accel, Flowmaster, and Cataclean through DTC, e-tailer, warehouse distributor, traditional retailer, automotive platform, and jobber/installer channels. Founded in 1903, it is headquartered in Nashville, Tennessee.