I've got the '06-'09 lo-profile C4Fab bumper along with a CBI front skid. My CBI skid is for a V8 and diff drop and it all fits fine. I say that because the bumper went on well and the skid wasn't in the way. I don't have any pictures of the two together but I do remember completing the last steps of the bumper install and seeing the two and liking how the factory gap was now covered with steel.
For those getting the '06-'09 bumper and maybe even the earlier model, I have one item to add to the install instructions. Remove the metal filler piece below the headlights. They come off very easily and by removing them the factory bumper will reinstall much easier and you will avoid scratching up your fender flares :bash: