There are 2 popular tuners for the Hemi. The Diablo Sport Predator and the SuperChips Cortex. There is some great info in the Mod Zone in the 5.7 Hemi V8 Performance section. Here's a link - http://www.ramforumz.com/forumdisplay.php?f=83
It's a big section.....over 3500 threads!
I am new to the forum and have a 2008 Ram 1500 4x4 5.7 that I bought in March with approximately 34,000 miles on it now. I keep seeing the advertisement for the performance chip that may increase power and gas mileage.