Diesel programmers and exhaust

Anyone know anything good bad indifferent about Green Diesel Engineering? Have a 2018 Ram 1500 Ecodiesel, and have been looking at their EPA compliant tune.
 
Anyone know anything good bad indifferent about Green Diesel Engineering? Have a 2018 Ram 1500 Ecodiesel, and have been looking at their EPA compliant tune.
If it is EPA compliant why wouldn’t the factory have tuned it that way. I would be skeptical of spending money on something for what gains you may or may not be getting.
 
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