Originally posted by krotchwaffle
you're thinking of that powerfunnel thing. that's just like you said, it creates a vortex in your intake, so the air spins in a little better. that piece of crap on ebay is a fan you put in the intake tube that acts as an electric supercharger. in theory, they could work, but the only one's i've seen are single speed, so they don't. i think that if someone were to try to somehow get the speed of the fan to vary with engine rpm, it might work a little. even then, it's waste of money.
think of it this way, if it worked, an aftermarket manufacturer would have picked up the idea already. it sucks to have that attitude, but with car parts, you get what you pay for.
I didn't even read it, I assumed it was a rip off of the poerfunnel vortex thing.