The Nitrous Express Diesel Nitrous Systems are guaranteed to boost horsepower, torque, erase that ugly black smoke cloud and dramatically reduce exhaust temperatures while adding horsepower. The NX diesel nitrous system is a safe, low cost add-on for your modified diesel truck. This system includes: 15375L Nitrous Solenoid High flow braided stainless lines Wide open throttle switch Two nozzles 8AN Feedline Master arming switch Relay and relay harness 15Lb nitrous bottle with the Lightning 500 Valve Stainless steel bottle brackets.