I thought I'd put this on here before Ebay. Traded in my 2004 Mustang with 3.9 engine and don't need this. Before trading in, I put the car back to the stock configuration program. This way it can be used again for another car. Comes complete except for the instructions, but here is a link for them http://www.thoroughbreddiesel.com/superchips-installation/1724.pdf This is in excellent, like new condition. That being said though, it is being sold as is, no returns. This made a difference in my 3.9 engine and trans. Do your research on this as it does other vehicles and engines. I take Paypal and will ship FREE in the CONUS. Others must pay shipping costs. Again, because this is an electronic tuner and someone could tune their car and say it doesn't work to get their money back, IT IS SOLD AS IS!!!