I am new to the duramax scene. I have owned 4 Cummins and just recently went to a 2009 GMC 3500 and i am loving it. I have been doing some reading about custom tunning and I am a little worried about the ECM logging tunes. For warranty reasons. Is it safe to purchase a new Ecm and tune it and save the stock one for warranty work. Also will the stock ECM log power cycles when removed, mileage and so forth. Thanks