[ChevyHighPerformance]

I didn't dyno before and after the tune yet - I'm still tweaking. The biggest thing I noticed was the low end torque and how much faster the H3 pulled out. My opinion only -> There are two major "flaws" in the stock PCM programming. One effects long-term engine durability and the other "flaw" I have never seen before in any other programs and makes even less sense to do this on the H3. The one flaw doesn't exist in the Colorado I5 tune which makes this confusing.

The dealer shouldn't touch the programming unless you tell them to. Unless they really know what they are doing, the dealer won't be able to tell that the PCM's program has been altered (unless they notice the performance difference). Cochran Hummer couldn't put on my mudflap correctly after they replaced my parking brake cable - so I really doubt they can detect a different tune. If they reflash the PCM you can just reload your modified tune or read in the new dealer flash and copy your new calibration tables over (timing, A/F, etc.).