I picked up a copy of the "New HEMI Builders Guide, 2003-Present" by Barry Kluczyk. It has a lot of good information on how to get more performance out of both the 5.7 and 6.1 Hemis'. However, one recurring theme kept raising its head.....the computer doesn't like this or new controller or tuner needed, etc, etc...........................With the new Hemi it's more electronic tuner and less screwdriver. This is not necessarly a bad thing....just different from the old performnace Mopars..........we have to remember that over thirty years seperate the new Challenger and the new (for 1970) Challenger. Everything is now controlled by computer, the new Challenger, our lives, etc.........just have to learn to work with it.