I haven't done anything at all on this bike, I want to wait until I can do exhaust, tuner, and A/C all at once. I am looking hard at the Thundermax tuner. Way expensive, but I think it will pay for itself in the long run, just by not having to Dyno after motor mods. I had originally intended to to all at once, but that is outside of my budget limits right now. I would definitly do a tuner of some sort with the exhaust and A/C. The stage one download from HD isn't worth the money IMHO, and doesn't fix the air fuel issues. Tough choices all the way around. Good luck with whatever you decide to do.