Performance Chips Do they work?

I came across this on ebay and was thinkign about getting it for around 5 bucks why not? I am not to knowledgable with cars ut am in the process of fixing up the ol 89 s10 into a show car but anyway here is the link

http://cgi.ebay.com/ebaymotors/20HP-SPEED-CHIP-CHEVY-SIERRA-S-10-BLAZER-89-95-96-08_W0QQcmdZViewItemQQcategoryZ42604QQihZ014QQitemZ 330179674898QQrdZ1QQsspagenameZWDVW

No,They do not work...or at least the 1 I bought didn't.
CS

no they dont work, just a scam.

that is what i figured thanks though for saving me the 5 bucks now if i can just get my heat working she will run like a champ