Completely regulated nitrous oxide system. Produces constant and consistent power without the need to regulate bottle pressure. Uses the Patented (6,938,841) Holtzman Automatically Adjusting Nitrous Nozzle to create a consistent volume of nitrous oxide into the engine. Patented piggy back solenoid allows the use of only one solenoid, making installation easy and simple. No Fuel Control Boxes needed for fuel injected engines. This is a proven and patented system with great results. Comes with all necessary mounting brackets, 30-40hp nitrous nozzle, waterproof button, patented solenoid, and detailed instructions. This is the safest and easiest kit to install with the most reliable nitrous technology available today. Bottle not included.