I searched these forums for "cyba scoops", came across the following thread:
doing a tad of reading down, i came across this:
Same concept. "Forcing" air into the intake area is the same idea as "ram air" in this case.
Also, for another matter, the amount of air you PULL into the car is controlled directly by the cars exhaust tract and the wastegates. There is no way to push more air past the turbine blades.
2nd edit: that's not to say I don't think they look cool and for $40 and a can of white spray paint I couldn't have a nice subtle detail piece, but that $40 could easily be spent elsewhere right now.