Holley, Inc. designs, manufactures, and distributes high-performance automotive aftermarket products to car and truck enthusiasts in the United States, Canada and Europe. It owns and manages a portfolio of brands, catering to a diverse community of enthusiasts passionate about the customization and performance of their vehicles. It is a manufacturer of a diversified line of performance automotive products, including carburetors, fuel pumps, fuel injection systems, nitrous oxide injection systems, superchargers, exhaust headers, mufflers, engine tuners and automotive performance plumbing products. It also manufactures exhaust products as well as shifters, converters, transmission kits, transmissions, tuners and automotive software. Its products are designed to enhance street, off-road, recreational and competitive vehicle performance through increased horsepower, torque and drivability. Its brands include Holley, Holley EFI, MSD, Simpson, Flowmaster, EDGE, and Accel, among others.