The problem with this idea is that most people who think of it really have no idea how much air gets pumped by the engine during its normal operation. The engine acts as a big air pump and is capable of moving huge volumes of air all on its own. With that in mind, any electric fan that you place in the path of the intake is only going to act as an obstacle to efficient airflow and not provide any level of boost whatsoever. In order to provide boost, the fan has to be able to force more air through the intake than is already being sucked and that's simply not going to happen with some off-the-shelf computer fan or bilge exhaust blower or whatever else you've found or had marketed to you.



Electric Supercharger

Now that you realize how futile the idea of an electric supercharger is, consider the dangers. If you place something in the intake path between your air filter and the engine and that thing isn't made to be there, you now run the risk of having it break and send unfiltered pieces into your engine, potentially causing catastrophic failure. I would hope this is more than enough to discourage experimentation in this area.

As a general rule, if something seems too good to be true it generally is. Modifying a car to add power isn't a cheap endeavour and most of these sorts of shortcuts will only end up burning you in the end.

Interestingly, the company from whom I got that image above even has a small disclaimer on their site with a list of cars that showed no gain from their units. The list included GM's 2.4L engine in both the Grand Am and Cavalier Z24. I suspect it likely includes all cars from ripped-off customers who bothered to get the system dyno tested.