Two Cylinder Piranha System with Single Nozzle with 2.5Lb Bottle Single 2.5 lb bottle ,single nozzle system for two cylinder engine with a single carb. Complete with "Lightning" nitrous and fuel solenoids, braided stainless hoses, "Piranha" nozzle, fuel pump, relay, microswitch, arming switch, jetting for 15, 25, 35, and 50HP 2.5 lb bottle,single billet aluminum bottle bracket. THE NITRO BOTTLE IS EMPTY! Instructions PDF