I know this it OT but that first drawing at the top from that perspective the holes wouldnt look like that would they? Like the drawing is wrong as its implying the holes follow a curve.
Apparently they do one called G5 but it's even better but lasts only 5 months.
I've got some rain x already in the garage already so gonna give that a try first.
Edit: until I get some more hardcore stuff that is!
All that Evo needs is the carbon vortex generator hedgehog spikes on the top of the rear windscreen, strange that he doesn't have them considering the rest of the car has so much carbon.