I never had an issue with AC but I have heard of people claiming that there AC was not running cold. I suspect that doing anything to make the engine work easier would help the other various engine systems.
Headers: It's a personal choice you need to make.
I can tell you that from the research I've done the various coatings like "Ceramic" and there are others but these coatings allow the headers to dissipate more heat than the stock manifold. I have spoken with several people I know and trust that build motors and they have all said the same thing that headers, one allow the engine to breath better than stock manifolds and two handle heat dissipation better. Yet I still seam to have had a heat issue with a plastic part located near the headers. I don't know if I would have had the same problem with the stock manifold. From what these engine builders are telling me I suspect the answer is yes. You can't put a piece of plastic containing electronics near a heat source and expect to to function for long.
My advice since you are having your dealer do the install which is great in my opinion and the way to go would be to leave the headers off.
Chances are unless you tow something you're not going to see the gains. Do I believe that coated headers dissipate more heat than the stock manifold? Yes. Do I think that it makes much difference? A difference that you can feel? No. But since I didn't do my modifications in stages I don't have a point of reference to base those opinions on. I changed everything out all at once shortly after purchasing the H2. I didn’t have much time develop much of an opinion on the stock H2 other than I hated driving from here to Ca and dealing with the constant surge the motor and or trans was making while going up hills because the H2 in it’s stock from is under powered for its weight.
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