I was in the same boat as many. I had my eye on the GDE tune since day one. After the AEM flash, I decided to get it but they had just stopped sales in the US. HD Diesel Supply in Canada seemed to be the closest to the GDE with a reputation to back it. Waiting a few more weeks paid off this...
Did you have the AEM installed? My conclusion on the AEM is that it's not that different than the original except for cold running performance. The turbo lag when cold was dangerously long. Once the truck warmed up is was still laggy, but that was normal for the ecodiesel. I'm curious that...
I just installed the HD Diesel Supply tune a few days ago using their new hand held tuner. It was very easy.
The difference was immediately noticeable due to the significant reduction in turbo lag. The motor actually sounds different, likely due to the EGR being closed (leaner mixture.) The...