SRT's are the easiest way to go BUT...
If interested in doing the Turbo thing, Theres a guy in Salt Lake I was working with to build a design for my Limited. Plus he's been working on a rear under bumper design for the Crossfire. And if your talking horse power, he and I discussed basicly "name how much you want". If you are serious have alot of money (about 14-17 grand) give Joe Loftus a call at STS and tell him Mike Loftus in Great Falls, Montana sent you to finish what we began. In all honesty what we had planned for my 04' would have blown my SRT with it's 22lbs of boost, into next week and not even breathed hard. This is not an exageration!
Mike