On the front I didn't have to cut the bumper at all, I did have to cut the pinch weld behind the inner fender. I just cut slits in it and beat it down with a Big Hammer. I put some rust preventive paint on it and used a heat gun to smooch the inner fender back. It gave me just the right amount of clearance. On a side note.... Does anyone know of a good website to order WK accessories like bumpers and such.