Not the bumpers. The upper control arm, the frame with the steering fully cranked, and just a little on the back. I had to trim pretty heavily at the back of the front wheelwell, that and the upper control arm are the biggest problems. 12.5" wide is going to rub a good bit without some bodywork. Of course it also depends how much you're flexing it out. If you're running for groceries - won't be an issue.
nahh it aint a grocery getter but its not devoted to the woods. I live in south jersey so i dont get to flex it to much. the only time it flex's is when im going through a mud pit thats heavly rutted out but thats about it. pretty flat around here. now with the control arms will it eat away at the side wall because my friend has a 91 pathfinder with a 4 inch lift and his 32's had a nice grove on the inner side wall.