Ebay Help!

Looking at the downpipes on ebay. Should I be doing this? Can any muffler shop install one of these? Or does the ecu have to be re-programmed or something? I dont need to worry about a separate cat do I?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33632&item=7967745989&rd=1&ssPageName=WDVW

Nope dont buy it... its cheapo