For the enthusiast who wants to use nitrous yet does not want to spend a lot of money, the ?Hitman is the way to go. The Phase 3 series nitrous plates are the ?Next Generation in nitrous performance and reliability. This new innovation in plates provides superior distribution and outstanding atomization. With no spray bars to sag, split, block airflow, or damage this is truly the ?Next Generation in plate technology. The ?Hitman is the perfect, low cost, introductory system for the nitrous novice. The ?Hitman Plus has all the great features of the original ?Hitman , yet it is upgradeable to Stage Six capability. The ?Plus comes standard with four horsepower settings (50, 100, 150, 200) and is upgradeable to 300 HP with the addition of a larger N20 solenoid and jets. System also includes 40amp relay along with WOT switch and bracket.