Nitrous Express Nitrous Oxide Injection System Kit NXD12003The NXD Stacker Systems are guaranteed to boost horsepower, torque, erase that ugly black smoke cloud and dramatically reduce exhaust temperatures. The NXD STACKER is the ultimate safe, low cost add on for your modified diesel truck. Hold on because the Next Generation Stacker nitrous systems are here. For the most advanced nitrous technology always look to Nitrous Express! Comes with Lightning 375 Solenoid for Big Nitrous Flow! NXD Super Stacker w