While searching for a new truck (about this time last year), I was destined to purchase a Ram Eco-diesel. I factory ordered one, and while waiting, joined the other forums looking for insight. One of the largest and most popular upgrades for the Eco-diesel line was to have your ECM programmed by GDE.
For those of you who don't know, please take a look at their website.
They don't claim their tune to make the most power, that's first and foremost.
What they do however, is make the engine better. How? How about turning off the EGR almost completely. Reducing DPF usage, general drivability improvements, and of course, increased power and mileage. Their tunes made the 3.0 Eco-diesel come to life, decreased dead spots in the throttles, helped to eliminate EGR from clogging up, made more power and achieved even better mileage, all while retaining all the stock factory equipment in its place.
For those of us concerned with warranty and not wanting to remove these parts just yet (or at all), these guys had the answer. Their claim was for those that had to undergo emission tests regularly, the tune would still allow them to pass, remaining undetected. However, as this is a tune, it does indeed void warranties. Some got crafty, ordered a second ECM to have the tune uploaded too, and when they required service, swapped out the ECM for the stock factory, and no one was none the wiser. They received rave reviews, not just from the Eco-diesel crowd, but those with Mercedes's, VW's, Jeeps, etc.
What does this mean for us? Right now, nothing. Last time I wrote them an email, they admitted to receiving more and more inquiring's for the 5.0 Cummins, but had not yet made a decision to invest into the R+D. For myself, who have no interest in ripping parts off a new truck until the warranty expires, this is something I would certainly spring for if it were available.
I'm not certain what level of interest is out there similar to mine, but if you have any, feel free to write them an email, badger them, and maybe we'll be lucky enough to get something, eventually.