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12 HP Increase! These dual 15" fans move 5500 cfm and include Variable Speed Control (60% to 100% depending on cooling required). The shroud is made from an injection molded glass-reinforced nylon for light weight and high strength. Dyno tests showed gains of 17 HP and 20 ft/lbs torque at the wheels. These fans improve gas mileage up to 6% and provide quicker warm-up and cool down. Includes adjustable thermostat (180°-240°) and AC relay.