Have fun with Elantra HB Nitrous Kits. To get the most bang for your buck, invest in a Nitrous Kit. These Elantra HB Nitrous Kits will get you the attention you want. A Nitrous Kit can double your horsepower depending on the size of your engine. Stay up to date by upgrading Elantra HB Nitrous Kits. Make your vehicle much faster with a new Nitrous Kit. Nitrous Kits are the easiest way to add power to your vehicle.