Gain 18HP+ and Save 2-3 MPG!Designed to fit mid-size cars, trucks and SUV's. Powerful twin Flex-a-lite 13.5'' fans can pull up to 4600 cfm with a max 28 amp draw. Compact one piece glass-reinforced nylon shroud features a full contact rubber seal and unique air flow flaps that allow maximum ram air cooling while fan is not operating. Built-in variable speed control module (operates fans from 60% to 100%) with adjustable thermostat, A/C relay and manual switch connection. Includes mounting brackets and installation instructions with wiring diagram.