Which valence have u fitted to yours quattro-matty? I think it's the non sline b7 with twin exhaust that I spotted in the original audi zine post?
Nice fit on that cabby though..
I fitted the b7 sline of the 2.0tdi which has the twin cut outs. And I also used s**t loads of clamps to hold it in place while the tiger seal set. But my bumper didn't have any cut outs for the exhaust so I had to cut them out myself for the valance to fit. It's a fairly easy mod hardest part is taking the bumper off
I'm not sure what the fit would be like on your sport bumper but I'm sure with a heat gun you could mould the valance a bit and get some tiger seal and clamp it so it should hold.