I have Poison Snyder flat fenders on my Jeep, and am running 37ís. When I am wheeling, my tires will rub on the back edge of the inner fenders, and on the lower corner of the inner fender. I am contemplating trimming the back part of the fender for more clearance, but when I was looking at it, I noticed there is a plastic vent right behind the wheel well, pointing down. Is there something up in there I should be concerned about? I guess I could cut it and let everyone know, but I am thinking that it is just likely an air vent or drain port, even though it seems a bit big for that.