Easy-to-install kit adds a second stage of nitrous to any manufacturer?s single stage EFI nitrous system; Faster than single stage systems because nitrous is added in two separately controlled stages; Operated by a push button switch for ease of control; Jets are included for adding an extra 50-250 HP This kit allows you to add a second, independently controlled nitrous system to an existing nitrous system. The ZEX Part #82064 Add-A-StageNitrous System begins with inline T connections to the base kit?s nitrous and fuel supply lines. Theseconnections then feed the 2nd stage nitrous kit?s fuel and nitrous solenoids. These solenoids arenormally closed but are opened when the base nitrous system is armed and the 2nd stage?s pushbuttonswitch is depressed. Once these solenoids open, the nitrous and fuel are delivered to the nitrous nozzlevia flexible delivery lines. The amount of nitrous and fuel that is injected through the nozzle isadjustable by means of metering jets installed in the nozzle itself. These metering jets allow for easychanges in horsepower settings.