Make your coupe unique with Festiva Nitrous Kits. To get the most bang for your buck, invest in a Nitrous Kit. Festiva Nitrous Kits are an easy upgrade. A Nitrous Kit can double your horsepower depending on the size of your engine. Driving is always more fun with new Festiva Nitrous Kits. Make your vehicle much faster with a new Nitrous Kit. Nitrous Kits are the easiest way to add power to your vehicle.