Interesting, As I am not opposed to dealers doing stuff like this I'm surprised authorized Ram or FCA repair facilities would do such a think. Huge liability there as they represent the company that services the warranty. Hence why I said Legal Mumbo Jumbo... If they install or remove something that will or may void warranty and do not have it in writing as this was advised against and will possibly void said warranty they are liable as the companies representative to honor the warranty, and I believe a dealer does work and gets paid for warranty work by the main company and can reject a claim leaving the dealer to foot the bill or in turn charge the customer. Someone that works in the service world can say if that is true or false or fill in the blanks hopefully
I've installed lots of aftermarket components on brand new vehicles, and every time we inform the customer that it may effect warranty in the future. Usually it's never an issue though. As long as we inform the customer of this and they understand it/sign a form, then we aren't on the hook.
Let's use the DPF deletes as an example. Say a dealer does a DPF delete, then puts through a warranty claim that technically shouldn't be covered due to the delete. If Chrysler finds out about it, the dealer is charged back the cost of the repair.
That's why it's usually best to talk to your specific dealer. Some dealers automatically will flag your warranty for even small things like a CAI, others are more lenient. At work the only time we deny warranty is if its proveable beyond any doubt that an aftermarket component caused the failure.