stand alone EFI for gen3 hemis

Personally I like more options.
-MS3x done yourself
-EFI Source
-LXModGuy
-XFI 2.0
-Factory with hotwire

All very good options. My suggestion is to pick based on available tuning. At the end of the day, you should pick your system based on what your tuner suggests. And, if lxmodguy is a really good tuner, it might be worth going with his system.