There seems to be a bunch of cheap "add XX HP" to your Crossfire chips all over ebay. I've been around the block once or twice so I believe these are all placebo items designed to separate money from a wallet. But does anyone know if these do anything at all- good or bad to a car?

Guy

Here is one example-

http://cgi.ebay.com/ebaymotors/20HP-...QQcmdZViewItem