If he keeps it tell him to stay away from Hennessey, he is well know for taking peoples money, and actually selling pieces of their car if left at the shop, some never get their cars back at all!! He is the mega scammer of the auto industry!
http://www.cherokeesrt8.com/forums/showthread.php?t=622
http://www.cherokeesrt8.com/forums/showthread.php?t=622