I agree with Pirate on all of this. I haven't bled the system yet to see if that corrects my slight overheating issue. However, cleaning the radiator fixed my main issue of the machine going into limp mode from overheating. Riding in Arizona I had to watch my RPMs and how hard I was pushing my machine in order to manage the temps. Again, I didn't let it get over 200. When you're on a 800+ mile trip in four days it becomes a marathon. I just wanted to get to the finish line so no need to push the machine hard in the hot desert air. Gilomen Tune will do wonders for performance. I can't speak for Assasin's or others as I have no experience with them. Everything I have read on here appear to be positive so I would definitely say a tune is in order and leave it to personal preference on which one you go with. As for performance, I cleaned my spark arrestor out it seems to allow the engine to breathe better. This may or may not assist in controlling the temps on these Gs.