Old idea, New marketing
I had an ad from a 60's car magazine hanging on my wall for a couple years some time ago. This one actually spun around. Same claims (air swirl = better performance/efficiency) but much cheaper.
Of course, that wonderfully swirling air swirls through all the tubes in the intercooler, rejoins (swirling) in the tube to the intake and then splits into 6 little swirls into the cylinders so the fuel gets distributed better. Uh, wait a sec...