The N/A is much simpler. You can even get away with not relocating the radiator at all. We have built them both ways. These fans work great, even in Florida heat as pusher fans: https://www.summitracing.com/parts/DER-16925 They wire right into the stock fan controller, and run without issue. There is a brushless version that would be better (but more expensive) that would eliminate the stock fan controller, and allow the ECU to run them directly.