if you are looking for a cooler engine why not put another fan in addition to the stock one.. thats what i did.. i have it wired independently from any other circuits so its just a simple switch that turns it on and off, only turn it on when sitting in traffic or on a trail.. usually saw temp drops of 10-15 degrees at idle/ low speeds

although i havent needed to use it much since i replaced my fan clutch on the main fan, i really havent been overheating

here is the one i installed though, its 10"