The CAT3304 Performance Module fits C3.3L Tier IV Final engines. This diesel performance module is designed for fuel economy with up to 30% increase in hp and fuel savings up to 10%-20%.Adjustable from your electronic device via our Ag Diesel Solutions Bluetooth Connect App or the included mechanical switch. you can adjust the power on the fly, Stock, +15%, & +30% hp. The module doesn’t flash the ECM, instead it receives the data from the ECM, optimizes the signal to the engine improving the fuel efficiency and power. These savings ensure a quick return on investment so you can enjoy greater efficiency and less cost. Plug-and-play connectivity means there’s no need to cut, splice or modify engine wiring. All Ag Diesel Solutions modules are Made in the U.S.A.