Nitrous Express 60070-15 Dominator 50-300 HP Gemini Twin Stage 6 Plate System with 15 lbs. Bottle Fits standard dominator flange carburetors Most technically advanced single stage plate ever designed Direct-port pattern assures perfect nitrous-fuel distribution Includes jetting for 50, 100, 150, 200, 250 and 300 horsepower Includes lightning solenoids, heavy duty 40 amp relay, stainless bottle brackets and extra D4 long supply line (Race Hose)