Z4 Nitrous Kits keep the roadster tradition alive. To get the most bang for your buck, invest in a Nitrous Kit. New Z4 Nitrous Kits add to the performance BMW provides. A Nitrous Kit can double your horsepower depending on the size of your engine. Add a little flair to your Coupe with new Z4 Nitrous Kits. Make your vehicle much faster with a new Nitrous Kit. Nitrous Kits are the easiest way to add power to your vehicle.