CBPP has taken an already amazing product and made it better, which seems to be a recurring theme here. We have taken the 4-Cylinder Nitrous express system and added an auxiliary fuel tank to keep the nitrous system wet, and not mess with the stock fuel tank. Our kit also includes two gauges: fuel pressure, and nitrous pressure, which further help to keep your sled safe. The auxiliary tank has a filler cap on top, has baffles to help keep the fuel down when you jump off the line, and holds enough fuel for 3 full nitrous tanks worth of runs. All of this goes together for a nice, clean install.