If you get a bilge blower, they do nothing.Forceflow (the best of the breed) and E-ram might give you a few more hp, but don't expect more gains than what a CAI will give. Don't get me wrong, best of the breed doesn't mean that it is something great, it means it actually will give gains and not a loss. Even these will barely make the needle move on your boost gauge. I know a few people who have E-rams, and they do give a little more response, but not much. The E-bay blowers are junk, a scam. The Forceflow and E-ram give a 3-10% gain (depending on model) which is not much. I would use a Y joint so the intake is free to breath and the other tube has the electric supercharger mounted. That way there is no blockage.

they dont work ! my car actually went faster with out one...

i thought about getting one of those for my old cavalier, but fu ck that. it sucks!