Add to the luxury and style of your ride with 7 series. To get the most bang for your buck, invest in a Nitrous Kit. Stay classy with 7 series. A Nitrous Kit can double your horsepower depending on the size of your engine. New 7 Series Nitrous Kits can improve your overall driving satisfaction. Make your vehicle much faster with a new Nitrous Kit. Nitrous Kits are the easiest way to add power to your vehicle.