it is junk.
It would have to be at an optimum speed all the time to have any results as well as be vehicle specific for the lenght of the runners of the intake and throttle system. A nice idea with a really bad execution.
I love the commercial with the guy spinning the water bottles saying see how the water flows easily now that a tornado action is happening.
Umm , it is because the water has moved aside to make an opening for air to pass bettween the 2 bottles at the restriction.It has nothing to do with the swirling action.Just stick a straw inbetween them and the same thing would happen ,swirling or not.