This is probably old news for some, but . . . when I replaced my chrome headers with new ones from Speedway, I knew the quality of most chrome plating today is not what it used to be. So I wanted to do what I could to preserve the look of the chrome from the outset. I purchased some hi-temp ceramic spray paint (rattle cans) from Auto Zone and sprayed the inside of the header tubes liberally before installing. I gave them 2 full coats, being careful not to let the spray get onto the outer surface of the pipes. I let it dry and then cured it according to the directions on the paint cans. This is an important step to achieve the protection I wanted. I did this several years ago and my headers still look new.