The airflow is supposed to allow for better performance. But in our tests with a 2004 Toyota Tundra and a 2004 Dodge Stratus, we saw no significant improvement in performance or fuel economy. The Tornado, $80, is a similar device made of stainless steel. It is the same product we tested for a July 1999 report, when we said it didn't improve power or gas mileages in two test vehicles.
With C.A.F.E. regulations & such these days, don't you think that the auto manufacturers would already incorporate something like this into their intakes to increase the gas milage of their fleet, if it in fact it REALLY worked? Same thing with fuel line magnets! I can't imagine the manufacturer NOT installing a 50 cent magnet to increase milage of their fleet.
For those "less than technical" people here, take my word for this: The LAST thing your engine wants is a turbulant intake charge! Having the intake charge move smoothly into the combustion chamber is a GOOD thing! Besides, modern engines are "port injected" which means the fuel is not introduced into the air flow until just above the intake valve, so making turbulant air before this is counter-productive. Placing one of these things ahead of an air flow sensor on a modern EFI car may actually HURT performance & milage as these sensors as they require a smooth airflow across them to work correctly!