Headers=more or less heat

Headers have more surface area and thus can emit more heat.

In the grand scheme of things you have an 800 lb thermal mass that is 200+ degrees in there so this never was a concern of mine.

If you wanted to keep the heat down, WAY DOWN, use header wrap. You can literally put your hands on the headers. (which I've done to keep my hands warm) I've used it on snowmobiles, bikes and cars. AND IT WORKS more than just to keep heat controlled. YOu actually have to jet down if you put an AFR or EGT gauge on the engine.