Most if any of the improvement in performance is gained by the water injection properties.
True water injection was used in the old Messerschmitt aircrafts as a performance blast.
PowerFoam was out a few years back and it was installed the same way and actually works kinda nice. I found it was more of an improvement in the way the motor runs.
http://journeytoforever.org/biofuel_...th/z/water.jpg
This is a basic view I found online. You add a few drops of dish soap and it creates a water soap foam from bubbling in the bottle. You draw off the top of the container and make it draw air from the air-stone. The soap makes bubbles and also makes the gasoline and the water play nice together.
Water expands .. steam. It has a boost .. and anti-knock properties that work nicely on small 4 / 6 cylinder motors that hold a high compression ratio.
I always adjust it till the idle falters, then back it up just a tad. Worked great on the Ford 2.3 Motors.