STAY AWAY FROM THE TORNADO!!! DON'T WASTE YOUR MONEY!
The Tornado "spins" the air, which creates tons of turbulence in the intake manifold. They're not worth the metal they're made of. Save your money and just put in a K&N panel filter. It'll be about the same price, and not only will you get better gas mileage, but you'll get more power...not much, but better.
As for the magnetic thing....that's just a bs marketing gimmick. Stay away from both of them.
Yeah, stay away from both those. Not worth a penny. The tornado can't possible do ANY good, because it's installed BEFORE the throttle plate, any swirling motion it does create, will be stopped by the throttle plate.
Gasoline will also not react to a magnet in any way, so the magnet thingie is a bunch of bullsh*t.