I have a ‘22 2500 PW and it does not have the ATMM modules, just bundled wires with stubbed out wire connectors. I didn’t really notice a change at all when the MDS kicked on with the stock muffler. I changed out the stock muffler for the Mufflex with the Magnaglow and now I hear a slight tone difference and also feel a small difference in road/ride vibration. Nothing annoying and I probably would not have noticed any difference at all but I was looking for changes.
Maybe I shouldn’t have tossed the stock muffler, I may want it back on in 6 months but I doubt it.