Have a picture or webpage?

*Some* cars actually benefit from these vortex things because it eliminates laminar air flow in the stock air intake system that "surprise" was poorly designed from the factory, and can actually increase mileage and power. Why would such a bad system be allowed to leave the factory? Simple marketing: they can up the HP in later years without doing anything major to the engine. You'll find that devices such as these work wonders on american cars, where the more fuel friendly import cars don't seem to show the same gains. Personally, I wouldn't ever buy such a thing, but on a commuter car, can't really hurt I guess, they're a cheap gimmick, but they're still a gimmick that works on poorly designed cars.