Matt from MT Audio had one on his, sold a few to a couple of other members as well.
dont know really, ment to help with engine cooling i got told
I doubt they would let cool air in tbh looking at them they will just help with the hot air going out, same principle to be honest. Looks way better than a bonnet scoop would on a clio any way.
doesn't work, actually does the reverse as you get an area of low pressure behind the raises section. The air passing over the bonnet and onto the screen actually stops the hot air leaving the bay