Just purchased a 2009 Hummer H3T with the inline 5 cylinder and automatic transmission. Of course I plugged in my V2 (black) and downloaded the tune. When reviewing the tune file there was a warning not to mess with anything that had variable valve timing. Since all these Atlas engines have variable exhaust valve timing I take this to mean a shouldn't fiddle with it.
So: The LLR is not supported? 2009 H3's with the 3.7L are listed in the supported vehicle list. I'm getting conflicting signals.