HOLLEY DOM / ALCOHOL PRO POWER (100-500h.p.) 'Pro-Power conventional nitrous plate systems are the most reliable and powerful of their type on the planet.Available in gasoline or alcohol enrichment and guaranteed rear wheel power up to 500 HP, no others even come close. Race fuel is required. Systems come complete and include lifetime guaranteed large solenoids, heavy duty 60 amp anti-flyback relay, a 15lb bottle, stainless steel bottle brackets, 14 foot D-6 supply line (Race Hose).