The Fleece Performance CP3K is a modified 5.9L Cummins CP3 designed to eliminate the factory fuel flow restriction that begins at 3,000 RPM. If you have a stock CP3 pump you are losing fuel flow and rail pressure after 3000 RPM, which correlates to lost h Every Fleece Performance CP3 is tested on our in-house engine simulator and pump test stand to simulate real world situations and ensure that each pump is ready to work for you! Designed to eliminate the factory fuel flow restriction that begins at 3000 RPM;Cost effective upgrade will allow you to maintain desired fuel rail pressure through your entire RPM range;Thoroughly tested in-house