You can do whatever you like, it just voids the warranty on that part. It is also on FCA to prove that the mod you made is a directly caused the failure you are trying to warranty. They can't prove a muffler caused a lifter failure or that leveling struts caused a transmission failure. However, if you install a custom tune you void the powertrain warranty.
'17 Ram Black Sport, Lorado tonneau cover, 20% window tint added all windows, DeeZee tailgate assist, 6 3/4 antenna, Carven progressive exhaust and 5" black tips, Bilstein 5100's set to 2.1, BFG KO2's, smoked third brake light, smoked tail lights, debadged.