My 2008 Ram with the 6.7 Cummins engine is getting near the end of its factory engine warranty. I have just under 60K on it. It runs strong and is basically stock. I am ok with my power and MPG and don't do much towing. I am thinking about a couple of mods for it (programmer, new fresh air intake, DPF delete, EGR delete). Didn't want to do anything earlier and risk Obama motors denying me any engine warranty work if ever needed. I hear mixed messages about some programmers altering the ECM and the dealer being able to tell that it was chipped. I am looking to squeek out as much MPG as I can. Anyone have any experience with this?