The cooling fan has to be removed, and the header pipe is sooo easy to pull off, I just did it to help, not sure if it has to though. One tip, run over that tank with a buffer before installation....really shines nice. Don't forget three pieces of insulating tape. One on each side of the side-frame, about one inch back from the radiator vertical. and one dead center on top of the nerfs...that's if you have them.