starting my 2015 vvt hemi journey

Holley is expensive. They are nice for almost infinite tuning. I've had great luck with Hotwire Auto. They can build a harness for your exact combo. Uses unlocked 2010-2011 Ram computer. You can use a diablo or whatever tuner from there on. Just ordered a harness from them two weeks ago. Twelve to thirteen week wait. Not nearly as expensive as Holley.
Until you factor in a Ram ECM and the cost of having it unlocked, and then the tuner.