The concept is not outrages at all. I have read someone presenting an argument with enough bits and peices of logic in it to appear knowledgeable, that the horsepower possible from an electric "fan" turbocharger is limited to the horsepower lost at the exhaust ... some 1/3rd - 1/3rd - 1/3rd "rule. Fact is, that argument is scientificly flawed in that it in fact assumes up front that the total horsepower is limited to approximately 3 times the net horsepower and that one would need a 50 hp electric motor to produce a boost.

The other argues that an electric "blower" will rob an engine of power. Again there is some fact mixed in with that argument ... enough to confuse. That argument holds only if the required cfm is more than the blower can produce. For example, a 3.4 liter engine consumes about 250 cfm through the air filter at 2000 rpm and about 750 cfm at 6000 rpm.

Guess what, as long as you can deliver more cfm to the air intake than what the engine normally consumes at each rpm (for example more than 250cfm at 2000 rpm or more than 750 cfm at 6000 rpm for the motor in my example), you WILL be boosting, i.e. turbocharging the engine. In fact, with an electric supercharger, your gains will be maximum at lower rpm than at higher rpm which is gennerally better than a conventional turbocharger run off the exhaust gasses at low rpm. And to kick the first argument out the door, consider a simple workshop electric blower that, with a 3/4 hp electric motor can produce over 1500 cfm through an 8" pipe! (search online for "ventilation electric blowers", and you will find many examples)

Don't beleive everything is impossible just because nobody is doing it ... consider that a so-called large company manufacturing and selling  turbocharger kits for $4000+ is not really interested in having their kit replaced by a few hundred dollor electric blower!