After installing my RS4 grille in the center, main grille area, I wanted to make my fog grilles match the same mesh style. While there are tons of options out there to buy generic mesh or worse yet, chickenwire from Home Depot, I wanted the mesh to match 100% so I went and bought some OEM RS4 lower grilles that I could then modify to work on my B7 Audi S4 bumper. You can pickup the grilles below:
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The process is nearly the same as the RS6 grille mod – simply cut out the mesh from the RS4 grille using a dremel or similar instrument, cut to the mesh desired size, cut out the insides of the existing S4/S-line grilles, then use ultra strong adhesive to glue in the RS4 mesh to the S-line grille surrounds. I had my body shop do the dirty work on this mod, but I used this DIY as inspiration if you want to try it yourself.
No paint is required, and the fog grilles are easy to take on or off by pushing in three tabs, so this is an easy DIY!