I was at my local dealer on Monday. Service manager said they had red flagged (5) 2019 in the last 2 weeks due to non HD tuners. Harley is requiring dealership service techs to connect your bike to the HD network before they do anything else. If you have had a non HD tuner, it picks it up immediately and posts a big message in red on the screen. I got to watch them do it, luckily it was not mine. If your bike gets red flagged before the factory warranty runs out, it also red flags your extended warranty. If you wait until the original factory warranty is out to use a different tuner or mods you are in the clear. As stated previously in this thread and others, this is strictly due to EPA compliance and their settlement of the lawsuit a while back.