UPDATE: Here is the thread I mentioned before: http://www.bionicdodge.com/bionic/index.php?topic=10794.0There is a guy on the Dodge forums by the name of hemifever. He has custom tuned a buttload of 4.7 and hemi Dodges. I think it was Bionic Dodge (I am currently underway/deployed so I don't have the bandwidth to try and find it), but he tuned a 3.7 Ram then a 3.7 Liberty (04 I think) with an SCT handheld tuner. He didn't have hard numbers available, but he said it was definitely noticeable on a stock configuration. Might be worth looking into if you plan some engine upgrades.
Good to be back home. I am actually going to give this a shot, I got a ridiculously good deal on an SCT tuner and will see what loading a tune into the Jeep does. If it doesn't work out, no big deal as I can use this down the road when I get my Challenger.