These are universal supercharger kits designed for vehicles equipped with carbureted big block Dodge 440 RB engines. Supplied pulley ratio will produce approximately 5-6 psi at 6000 RPM on a lightly modified 440c.i. engine. Horsepower gains (depending on boost levels, engine volumetric efficiency etc.): 30-75%+. This is the tuner kit which will require a custom tune done locally after you install the kit, and does not include a PowerHat, discharge components, and fuel system.