I agree Rick. These are the same fans I'm using, and cooling in S-and-G traffic has never been an issue. With that said, I've made mine where the shroud (with fans attached to shroud) can be removed in five minutes for track days. I learned the hard way to remove the fans for track days due to high-speed air forcing the fans to over-speed and self destruct. Nearly ruined a custom radiator when the blades grenaded. Anything above 25 MPH keeps the engine cool without fans. I hadn't realized air moved through a radiator that efficiently or quickly.