So my cousin has a 99 dodge cummins. The previous owner had a quadzilla on it and it is still on it with a custom tune. He didn't want to give him the iPod with app on it to monitor it. Tryed getting app but of course as we all know quadzilla not in business anymore. We need to get it off cause we are going to install edge juice with attitude CTS. So we can't get the app and can't get the guys iPod that monitors it so.... What is the best way to handle getting truck back to stock tune??