I installed the superchips tuner (1704-A)in my 2005 King Ranch 6.0 4X4 crew cab this past weekend and I can't believe the difference that it made. Better throttle response, less turbo lag, and almost 2 mpg gain! Of course I had to play a little to find out what this tune can do and I'm sorry to say that there are a few kids in the area that got the shock of thier lives when my truck left thier slammed downed, fancy paint job, over rated rice burners in the dust! OH, what a happy day....life is good!!