I think the best way to look at it is this:
1-Putting after market accessories on your truck does NOT automatically void your warranty. As has been said many times the M&M act ensures that.
2-However, putting these mods on DOES just about guarantee that at the very least you will get hassled by the dealership depending on what type of problem you have. If you put an Edge module on and your right front wheel falls off because the bearing failed you're probably OK. But if your turbo fails they may be able to deny your claim since the turbo is electronically controlled by the ECM. Even though we know it's almost impossible for the Edge to damage the turbo, there technically is a small chance that it contributed to the failure.
3-In these cases, right or wrong, I believe we are considered guilty until proven innocent. So the burden will fall to us to prove our after market performance parts didn't cause the problem. The question is, how many of us are really prepared to take the time and spend the money to get an attorney to take a dealer or Dodge to court if they/Dodge refuse to honor a warranty claim?
Since I'm not fortunate enough to afford to keep an attorney on retainer, I suspect that if the dealership sticks to their position and my choice is pay the bill or go to court, I'm either going to pay the bill or buy the parts at NAPA and fix it myself. If the dealer backs down from the threat of court thats one thing, but if they call your bluff I just don't see it making sense to go to court unless it's a really big fix like a 10k engine replacement, especially when you consider you could go to court and lose.
I know it's not right and it sure isn't fair, but that seems to be the reality of it. So if you really enjoy modding your truck and want the performance and mpg benefits of it, go ahead and do it with your eyes wide open.
If you're on a tight budget and you can't afford to have to foot the bill if something goes wrong and the dealer refuses to fix it under warranty, then it's probably best to stay stock until your warranty expires.
Sorry, I didn't mean to sound like Dear Abby on this. I guess I've spent too many years preaching to my 6 kids on stuff like this.............