I've heard of these and heard they are useless. It's like sticking a hair dryer on your engine. You might aswell use a leaf blower, a lot cheaper too. Either way though you're using electrical power to make more power, if you do the math at 12V you need 160+amps just to run the thing

If you google electric supercharger the word "scam" comes up over and over
Personally I'm not a fan of these or superchargers, turbochargers make sense IMHO, you're using energy that would normally be lost.