Stumbled across this online auction for a Tornado Fuel Saver look-a-like today. Listen to the wonderful reference he provides:
"Proven tests! Vortex Booster Technology used in Chevy Vortec Engine (Source: Popular Mechanics)"
Well, Popular Mechanics actually did test a Tornado Fuel Saver. Unfortunately, the results were not very good at all. It reduced horsepower by 10% and failed to improve gas mileage at all. Perhaps he's refering to the Vortec cylinder head design... which has nothing whatsoever to do with this intake restriction whatsoever. These things look like they'd be better used for slicing apples than improving engine performance.
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