superchargers on Ebay?

i saw these cheap looking.. and cheap to buy...superchargers on ebay and they claim that they can give +30hp or somethin like that or 25% more hp!! i dunno if i beleive this heres a link for a few different ones would these work? would they be really crappy and break or somethin?
thanks

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33741&item=2466768149

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33741&item=2467278151

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33741&item=2466198755

man if i were you i wouldn't go near that stuff.. i'd never buy anything off e-bay unless i knew it was name brand quality stuff... you can get screwed really easily on places like that if you're not super careful, especially with car parts

well ive bought alot off ebay that was exactly what i thought i was getting and have never been screwed. i saw these and im just wondering if they would work?

http://www.homemadeturbo.com/tech_projects/el_blower/index.html
check out this site, they tried one, and they say it does JACK. go ahead and read it.

hahaha oh man.. that's too funny