some people like it on, some like it off. with IFS, it's not such a big deal as there is only so much travel up front anyway and you'd have to be driving stupid fast around corners with it off to lift a tire or roll the truck. i never ran my sway-bar after the 4" lift because it was noisy and barely reached. if you want it to reach, it's best to extend the drop links. taking corners in mine with the 4" lift and no sway-bar did make it lean quite a bit, but it wasn't anything i was fearful of. evasive manuevers on the highway, however, were a bit scary. use your judgement, if you're comfortable without, go without, if not, run it. it's only a couple nuts to remove before you hit the trail anyway.