Went with a friend of mine who has a 2014 has had since new, all stock, He did a full delete after aem flash in Canada no benefit for us to get it done no extended warranty or money back for now. Anyways had some questions for the shop, they do full deletes and have been doing at least three a week on Ecodiesels, after three weeks he is so impressed with the performance and mileage similar to GDE delete, off road, the only thing I noticed his tailpipes are black now. The shop says that's all the soot coming out of intake. They have been doing tunes and deletes for quite a while on Cummins. But it sure sounds different more like a Diesel.