The 12100 Performance Module fits 8.3L & 9.0L Cummins w/ CAPS Fuel Pump engines from 1998-2005. This diesel performance module is designed for fuel economy with up to 30% increase in hp and fuel savings up to 10%-20%.   Adjustable with a three position 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.