Add some more style by upgrading your J-30 Nitrous Kits. To get the most bang for your buck, invest in a Nitrous Kit. You can�t miss with J-30 Nitrous Kits. A Nitrous Kit can double your horsepower depending on the size of your engine. Treat yourself to more luxury with new J-30 Nitrous Kits. Make your vehicle much faster with a new Nitrous Kit. Nitrous Kits are the easiest way to add power to your vehicle.