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Alex, I am running a dual Derali 14" fan set up in my truck. I tossed the mechanical fan all together. Gained about 6 hp and 8 ft-lbs of torque across the whole RPM band. Makes a nice change.
As for a kit, I made my own. Granted, I am an electronics tech by trade, so, wiring is something I do all day long. So, I saved myself a few bucks. The big thing that I will tell you to avoid are the "wire wound" temperature controllers. While they are cheap and work great for the first year, after that, plan on having lots and lots of issues with them. Go with one of the electronic controllers that has a relay associated with it. Costs a few more dollars, but it will probably outlast the truck.
If you want any more info, let me know.