I was going to connect one to the coolent system and the other to the IAT system,, but i tried both to the IAT system ,, this worked the best for me. i had also installed a fan on the radiator from a hemi truck. the small door in the rear of the fog lite did not exhaust all the air that the heatexchanger could flow so i opened it up,,, guess what ,,it also cools my brakes what Rob is doing is making the HE with Fan and mounting brackets ,,you could mount it where you want and to the radiator or the IAT water system,you could try the flat idea it may be all you need. here are some pic of mine mounted both to the IAT system. don't know about the price ,,Rob told me he will let me know in a week or so what mine cost.