Hey Glider, Hobbit, Smitty et al! Hope you are doing well! I was talking to a dude that used to work at a local shop here, and he told me that the new HD ECM's will auto-tune- or "learn"- on a "closed-loop" system, just like a ThunderMax (or similar aftermarket "smart" ECMs) do. He says that HD doesn't advertise that for obvious reasons. First off- is that true?? Second- what is a "closed-loop" system? THANKS- as always!