Total junk and lies.
Think about it in the most simple terms. If a device like this could add 40hp and reduce gas consumption by 50% (which is an absurd claim) for $59, all of the car manufacturers would jump on this and make it standard on their cars. They spend hundreds of millions of $$$ to struggle to meet CAFE standards, and they could get there for $59 per car?
On a more technical note, this claim breaks the laws of chemistry and physics . How do you INCREASE air consumption, REDUCE fuel consumption and get more power, when the engine is already running at the optimum air/fuel ratio?
If it has any effect at all, it would most likely REDUCE performance by disturbing the existing air flow.
"SuperWhirl is a stationary high density vacuum compressor." WTF? Bahaah - Sounds like Marvin the Martian's "Illudium Q36 Explosive Space Modulator"
The SuperWhirl is a technologically advanced piece of air compressing technology striking the auto market by force. Increasing horsepower is only seconded to the fuel saving capabilities of this piece of technology. SuperWhirl is a stationary high density vacuum compressor.
Power: The SuperWhirl has the capabilities to turn a stock or modified
intake into a supercharged vacuum chamber. The airflow generated will be greater than any supercharger or turbocharger on the market. We personally guarantee at least 40 HP added to your ride.
Economy : The SuperWhirl will make your engine sip gas. Your fuel consumption will decrease by about 50%. With all the money you save on gas, you can add superwhirls to all of your vehicles.