4.8 bumper: I have done it on a 4.4 but I'm sure it's just the same on the 3.0. I have the headlight washers and PDC so getting the 4.8 bumper was an exact match with the option i had. No need to get new wheel arches to do the 4.8 bumper install.

Alum Running board: I have done this as well, the whole kit comes complete with arches that looks exactly the same as what you currently have and the only difference is it has wider connector part to the side steps. No flares.

4.8 flares: if you want the 4.8 flares, you'll need to buy it separetely as well as buying the flare that attaches to the rear bumper...