Essentially the main faults with wrap is that it traps moisture and corrodes the pipes from the outside. Now if you've got a ceramic coating it should stop heat transfer from the inside to the outside of the pipe, which will lower engine bay temps so you shouldnt really need wrap, but if the header is ceramic coated, this will stop corrosion yes? so effectivly you could wrap it aswell to further decrease temps but i dont know if you'd need or want to