I t did not take too long to install, maybe 1 hour. I have the basic TAG. My truck has 24,000 miles on it. Also one needs to keep the funnel ring inside the compressor housing to keep the air velocity up. My driving style is mild, I let the torque bring the truck up to speed rather than mashing down the peddle to get up to speed. I had the truck weighed and with the shell on, only 3 gallons of fuel in the tank and me standing off the truck scale it weighs 6780 pounds. So with my 170 pounds plus a fill up it is a honest 7000 pound truck. I am just very happy getting a consistant 21. 7 mpg.
Just installed a BD short shift kit last night, love that too. That was a piece of cake to install, 2 hours max. The directions were not good and the six speed is so much simpler than the five speed when looking at the directions.