Exergy Performance Cummins 12mm CP3 Injection Pump will support up to 1000HP on 2003-2007 5.9L Cummins applications. For best performance use a 150 GPH or higher lift pump. This modified CP3 offers fueling capabilities up to 4500RPM, where a stock CP3 falls off at 3000RPM. Based off of a 6.7L Cummins Pump. Custom tuning is required. No Core Fee.