http://www.chris-longhurst.com/carbi...oil_bible.html
look for retrofit devices:
this is almost the same.
The Tornado Fuel Saver
Websites : tornadofuelsaver.com
This thing is known by many, many different names, including the Cyclone-Z Fuel Saver and the Dynamix Fuel Saver. The basic premise is to make you believe that by swirling the air in your intake manifold, you'll get a better fuel-mix which will result in cleaner burning, longer-lasting, more emission-friendly engines, that at the same time give more horsepower.
It's a great theory, and for $69, who could resist? The theory is sound. So sound in fact that carburetors and fuel systems have been swirling the air in the intakes for decades. It's called the venturi effect and it's why carburetors can freeze up in the winter.
John Matarese of the "Don't Waste Your Money" website has a good writeup of a Tornado review. You can find it at this link. His results? Less than a 1% increase in fuel economy. Not quite the 20-30% promised.
The US E.P.A has not tested the tornado fuel saver, but after testing more than 100 similar products including the Cyclone-Z (report PDF) and the Dynamix (report PDF), the E.P.A says it "has not found any product that significantly improves gas mileage."
Let's face it. If these things really worked, GM, Ford, Volvo, BMW and all other manufacturers would be buying them by the millions, and cars would come out of the factory with them on. And speaking of the factory, bear in mind that most car manufactures can and will use an engine add-on as a reason not to honour your warranty.
Magnetic Fuel treatments