If I recall correctly, one was dynoed on a DOHC 4.6L V8 over on corral.net ...not even 1hp gain. The thing about these gimmicks is they make sense. They *should* work, but they don't ...not on cars. Spiraling air seems to work on aircraft engines though.
I think I'll pick up a
Fuel Magnetizer and get 10% more hp and a boost in fuel effeciency instead. [IMG]i/expressions/face-icon-small-tongue.gif[/IMG]