Supercharger
#6
Never heard of this, figured it couldn't be right. Did a quick Google search for electric supercharger - sure enough, most of these probably won't do squat as it would be difficult to generate enough increase in air pressure with a fan running off the car's electrical system. Difficult. Not impossible. For $180? Highly unlikely I'd say, but I haven't seen the actual ad the OP is referring to.
#7
#8
#10
"And we have to admit, the additional power is nothing to write home about."
So they dropped over $400 for two leaf blowers and other components, added two more gasoline engines under the hood, and gained around 24hp peak on a L98. Gas powered leaf blowers are going to provide a decent amount air pressure, and two of them did provide some boost, but not much. The electric kits just aren't going to get it done.