The Nitrous Express Three-Cylinder PROTON system with a 1.0 lb bottle is a direct-port kit for carbureted three-cylinder engines. It includes the PROTON solenoid assembly, braided stainless hoses, Piranha nozzle, fuel pump, relay, microswitch and arming switch, plus jetting rated for 20–50 HP and a 1.0 lb bottle with bracket to support straightforward installation and tuning.

Nitrous Express Three Cyl Proton Nitrous Kit w/1.0lb Bottle