HOLLEY 2-BBL (SPECIAL ORDER ONLY)STAGE SIX (50-300h.p.) 'STAGE SIX nitrous systems are the absolute perfect entry level systems designed for the budget conscious sportsman racer.These systems feature the most advanced technology using the conventional spray bar design. This system includes six power settings (50-300). Systems come complete and include lifetime guaranteed large solenoids, heavy duty 60 amp anti-flyback relay, 10lb bottle stainless steel bottle brackets, 14 foot supply line (race hose). Race fuel required for all settings over 150 HP.