Have you found yourself with a failed CP3 in your 5.9L Cummins? Ever thought about installing a 6.7L Cummins CP3 in its place? The Fleece Performance 5.9L To 6.7L CP3 High Pressure Fuel Line Adaptor Kit is the kit you need. The 6.7L Cummins CP3 has slightly larger output over the 5.9L CP3 giving you more adequate pressure for larger injectors and better performance throughout the RPM range. The kit includes a new high-pressure fuel line, high flow feed and return fittings for the CP3, CP3 feed line and hose clamps.