Had a dual exhaust put on and cut the holes out myself. Sprayed the lower part black. wasnt to happy with it,looked ok,but not tip top. Long process but got there... Stated off with looking for a rs4 bumper. Found a damaged one for £50. I say damaged as i only wanted the valance to cut off. Then the lower part of my b6 bumper in my colour,one popped up on ebay £20 Then some of the hex grill,had some left over from front grill mod. To go in the inserts. Had to get some gloss black plastic to act as a solid behind the grill mesh. So i cut the valace off the rs4. Put it against the new lower and trimmed the new shape onto it,made it a little smaller thou. Cut the plastic to suite the size of the cut out for the mesh. Put cut out in place and siliconed it and srews. Then in the same area cut the hex grill to fit. And stuck on. Srewed the valance onto the bumper. From underneath,cut off excess srews. As mentioned i made the cut out smaller so i had something to screw to. Finished off with a black rubber trim covering the cutout and srews. happy with it but there is damage to the lower bumper,which i didnt notice when collecting.