On my 09 efi America the right header pipe is starting to discolor badly. The left header pipe has not begun to discolor more than 1/2" coming out of the engine. I know on the carbed models the air box removal was a fix for this. I have read that on the efi models the air box should not be removed. I don't really mind the discoloring but am a little concerned about the fact that it is only happening on the one side and not on both header pipes. Also my bike has a habit of stalling and shutting off when idling. When I start the bike or am sitting still (such as at a stop sign or light) I have to keep on the throttle or the bike will stall and shut off. It idles at around 1,000 - 1,200 rpms. I thought that was a normal range. I love the bike and hope nothing is wrong with it. A buddy at work who rides HDs says he thinks it may be running too rich. I am not a mechanic and don't know. I am at just under 900 miles right now. The dealer did the first service at about 570 miles. I am still using semi-synthetic until the next service.