They'd be better off (dollars wise) buying a 6 cylinder and re-powering it with all the right stuff while upgrading the chassis for the extra power. If I had a new GT500 the last thing I would want to do is tear it all up, especially for as much as they cost new. I have a Mark Vlll that fills the need just as well and has great room in it for me and runs like a champ, and yes it cost as much to build as a new Mustang GT. Crazy Roadboss!!