S&S SuperSport Replacement CP3 Injection Pump is recommended for applications up to 500HP on 2001-2016 Duramax applications. For best performance use a 150 GPH or higher lift pump. This modified CP3 offers higher output above 3,500 RPM where an OEM pump falls off around 3,000 RPM. Based off of an LBZ Pump and comes standard with an LBZ FPR. Custom tuning is required. No Core Fee.