This Billet LT4 Supercharger Lid replaces the upper supercharger lid on all GM LT4 Superchargers for a quick and clean install. The lid is made from a solid piece of billet aluminum with 1/8NPT bungs machined directly into the plate, to provide a truly integrated water/methanol direct port installation! , , This system comes complete with billet aluminum and carbon fiber lightning water/methanol solenoids, high pressure electric pump, stainless steel hardlines, filtered nozzles, nickel plated fittings, composite reservoir. switches, and every nut, bolt and connector needed to install the system. This system also comes with the NX stage 2 digital progressive controller that controls water methanol output. The stage 2 controller is adjusted by setting rotary dials on the progressive box.