I have two 16" Proform fans (2500 cfm ea) with an adjustable thermostat controller. The fans turn on at whatever temp I set it to, and I also wired it to come on when the ac is turned on. I fabbed up a custom shroud and have had the setup for about three years now with no probs, and even running the engine hard with the supercharger, temps rarely ever get up above 195*. I just did a few hard runs this past weekend in near 100* ambient temps with the ac on, and coolant temps stayed under 200*. I spent under $100 total for both fans and the adj stat.