If your Cummins diesel engine is for everyday use and you don't tow this could probably work for you, but if you tow, even a light one (I tow one 21-foot trailer), this will cause you to be stranded on the side of the road overheated. With my stock fan and fairing, I could tow 65 mph on the interstate, and the engine temp never went above 195 degrees. First hike this summer after installing Flex-a-lite and the first steep climb. I used to just drive over the top and my temp gauge was 240, the…