i just put on a 800 cfm 8inch perma cool fan from jegs cost 58.99 plus 7.69 for relay fit the i/c perfect and use the small switch that was for radiator fan no longer needed as eec tuner turns on both low/high speed fans at 189 degrees. now i can cool i/c between runs without key or leave it off in winter.relay is the best way to soft start electric motors, and control proper current.