Those flaps are not stock. The hardware is USS coarse thread. I think I see welding flash, or evidence of, in the first picture along the bottom side of the bumper. I'd just take them off, too.

When I had my first set of 33s and was test fitting, I snapped these photos:







I trimmed the bumper end and the splash guard inside the front wheel well. After my second set, I found a nice place to flex the chassis up and shot this photo:



The tires did not rub, no suspension tweaking, just the minor trimming. The first photos have 10 inch wide rims, the last has 8's in the front and 10's in the rear. The different rim width evened out the tire exposed beyond the fender.

R-