I'm new to this site and love it. I have an 05 mustang gt with 60k miles on it. I'm about to start building it up to run 12 flat. Before I start I sell cars. We just got an 05 mustang gt like mine with only 36k miles on it. To trade it will cost me about 2k-3k more than what I owe on mine. What do you think guys. I know my car hasn't been dogged out or nothing. Don't know history of the new car.