Electrical
Ram Guru
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That said all that is only because you have an interest in this. For most people it just works seamlessly in the back ground and they are unaware when its going through a regen. GDE does an actual ECM tune which gives them a lot more latitude to do things in the right way as opposed to a piggy back tune that just manipulates or fools some parameters. Many don't know they were diesel engine management engineers for the industry back before Chrysler went through its downsizing. Most quickly learn that GDE's off road tune turns off the EGR so the engine is not recirculating its own waste but few know how much better their regen strategy is and that it does not regen nearly as often. Naturally headline features are more power fuel economy improvements shutting off EGR etc.
I've seen the pics on the 1500 diesel forum and what EGR does to a diesel seems criminal. I assume those pics are typical of all owners, and are not special cases from just one or two people (?).
I also saw some owners comment that some dealers are ok with GDE ECM's and don't give warranty hassles.