Any one of those systems will add one hell of a punch to your 4.0- but they all have advantages/disadvantages. As far as I know, Andy at TMA Turbo is the only person who makesa complete turbo kit for the V6 cars. The turbo is a great choice, but the price is whaat drives most people away. the procharger and vortech are great centris, and will give nice power and torque. both are self-contained units, and quite comperable. the Xcharger, being a positive displacement blower, will give you amazing torque, but you might give up a little power for it. for a DD, something like this will be most fun, as the torque is rightt here in the low-RPMs where you can use it