Regarding dealerships that seem to be the way the Stages are required to be installed through, very few are actually qualified to do those modifications, and if you ask them can you do this for me and they give you that first reaction of a deer in the headlight. It may be because they have not even done it before and are trying to quick think what mechanic they actually have that could actually do it. You have to keep in mind that highly skilled mechanics are not cheap to keep on hand all the time especially when major repairs requiring internal engine work are few and far between. I am familiar with the local CJDR dealerships in my area, the closest to me has the worst record in the entire town, I would not trust them to put air in my tires.
The next closest that we bought my wifes Charger from I do trust for maintenance on her car as far as oil changing goes, but not my Challenger, because they were supposed to resolve my Tire Pressure monitoring system issues, and their resolution was just temporary, it was not a fix. Now the dealership I actually bought my Challenger from is 125 miles away, which I did trust until they lied to me and I caught them in the lie. So trusting any of these dealership service departments needs to be because they have a high mechanical rating and are skilled in what you need done.
The best question: How many of these performance upgrade procedures have you actually done here, and what mechanic would you put on this project, and can I personally talk with him or her? I mean come on, this is your baby, it has run good since the day you bought it, you don't turn your baby over to an ignorant mechanic that may possibly be the first time to do this procedure.
Remember: The percentage of the population that actually have a dealership do any performance upgrades on their Challengers is extremely low, most Challenger owners are only concerned with oil changes and tire replacement. Ry