Do more with Axxess Nitrous Kits. To get the most bang for your buck, invest in a Nitrous Kit. Axxess Nitrous Kits open up the possibilities. A Nitrous Kit can double your horsepower depending on the size of your engine. Take a stand against normality with upgraded Axxess Nitrous Kits. Make your vehicle much faster with a new Nitrous Kit. Nitrous Kits are the easiest way to add power to your vehicle.