Interesting that the GTN had what I presume are 2 circular air ducts in the front wings.
These had the matching S/S mesh covering as the rear of the grille and were,I assume, designed to funnel more air to the brakes.
Personally,I also think it enhances the 'look' of the very slightly 'slabby' frontal area.
The only S1 ,other than the GTN's ,that I have seen with this mod. is Viper's lovely blue S1....
James