Cummins Celect and Celect ECM's for L10, M11 and N14 engines. These ECM's go through a rigorous remanufacturing process! They are completely disassembled and high milage prone to to fail electrical components are upgraded or replaced. They are then tri-temperature tested under load and thermal extremes. Nobody remanufactures these ECM's better, not even the more then double over priced Cummins dealer!