supercharger?

im looking at this thing on ebay and im not sure if it would work or not for my car because i was planning on getting ram air hood and air box and all that but if this blower or whatever it is is better then i could save like 600 bucks.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2427100400&category=33741

I would get all of that other stuff first because if thats all that comes from ebay its missing some stuff for install and it will cost alot to install too

also if your engine isnt set up to handle a supercharger it can wreck your engine

Those electric superchargers are a waste. Get the other stuff, you'll gain hp with it.

the thing says it gives you gains of 10-30 % horsepower so thats all not true then.