This is the Raptor-4G RP-100 fuel system for the 2015-2016 6.6L Duramax. This system mounts to the frame jig in front of the fuel tank for a clean looking installation. The suction line connects to the factory suction fitting on top of the fuel module. The pressure side connects to the factory injection pump feed line on the frame. These pumps are internally regulated and do not require a return line. This is a 100GPH (Gallon Per Hour) fuel system for stock fuel trucks.