Duncan -

You're right about that, they definately put the latest (or newer) software in it. The truck is a 11/29/03 build, and originally had the quiet idle feature (Fake PI - EGR/ICP manipulation) and now it's gone. However, I really don't mind the loss of the quiet idle as the truck is just as smooth and quiet going down the road, and even quieter at highway speeds than my old 02 duramax that was equipped with pilot injecton.

I still find it a bit strange that some of the newer flashes (like the newest July flash) only apply to post 9-29-03 build engines and not to the 03's or pre 9-29-03 build (early 04 models).