Anybody heard of these?

The next one will be mini tornadoes that fit inside each Venturi.
Right? or some twisted section of plate you install in the intake runners.
Not that long ago someone had a 12v heated screen that went in the intake under the carb, and that one held my attention for a couple of seconds. :D
Never heard of it doing anyone any good though.

One of the more expensive scams was the aftermarket Hydrogen generators they put in cars.
Thousands of dollars and very tiny difference if any.
One of my Wife's friends wanted to buy into a home business doing this and for me to do installs for them and I flat refused.