I installed a Flexalite FLE270 dual fan on my 04-5.4l a while back. I love it.
It opened up space between Rad and and engine,you can change pulleys after install.
The hardest part was figureing out the wiring connection points.
I finally figured out a good fix that made for a clean install. I reinstalled the to deflector over the rad. to push the air down over the engine. My engine coolant temp usually showed 192. I used an infrared thermometer to chec temps a several locations (this is an unbelieveably valuable too and worth the cost) With the fans running and the fan stat set at 190 I was getting rad. outlet temps as low as 160. This caused the thermostat to close and the truck to run at cold Idleor run which uses more gas.
With the thermometer I could adjust temp. control to 220 which gave me an outlet reading of 194 and no more cold run conditions. Saw about 2 mpg increase if I keep my foot out of it
like thats gonna happen. Fans don't run very long and stage in so I have not noticed any electrical loading at all. Hope this helps.