[richmondwrecker08]

for exampleee help me distinguish between the pros and cons of getting one of these 5 tuners on posts i found on craigslist

http://houston.craigslist.org/pts/1248225330.html
http://houston.craigslist.org/pts/1238895500.html
http://houston.craigslist.org/pts/1220080300.html
http://dallas.craigslist.org/dal/pts/1252581856.html
http://dallas.craigslist.org/dal/pts/1223933466.html

which ones need me to do another tune? do all of them work for my car?