Yeah, trying to get the air flow from behind the radiator to flow up out the bonnet and over the windscreen.
I've heavily dislike the brick wall air flow barrier behind the radiator since I bought the car and I thought this would be a more effective modification over something like a front splitter or a rear diffuser, which are both annoying things for a daily driven car.
Funnily, I believe I might even still have space for a spare tire...