I test drove an 05 fx4 around for 2 days before i got my 04 lariat saturday and the fx4 seemed real sluggish especially compared to my lariat. My truck seems to have much more low end power n much smoother n better shift points. I think that there might be a chip/programmer or some different gears in it. Is there some way that I can find out? I have no clue bout things when it comes to things under the hood...