As far as I'm aware, with any of the Stage 1, 2 or 3 downloads at the HD dealer you are still going to end up with the mandated 14.7 to 1 AFR. As long as the bike is a street bike and not a racing bike they can't legally do anything else. They may add more fuel, raise the rev limit and change the timing, to compensate for different breathers & pipes, but at the end of the day it still has to run the 14.7. to 1 AFR. And yes in my view the XIED's would void a warranty. They are no different than any other aftermarket fuel management system that you add that doesn't have the HD seal of approval. I haven't seen any dyno runs with & without an XIED but it would be interesting to see what is actually going on. There is no doubt you are adding fuel to the mixture and the bike does run better, but at the end of the day I don't know what if any gain in HP or Torque there is. I wasn't interested in this end of the tuning, just wanted to have better all around drive ability on a stock bike. That they have accomplished.