i added EGT bungs to my coated headers. real easy to do. Make a stencil by drilling a piece of sheetmetal big enough to fit the bung with room for a tig weld around the bung. With a home sand/media blaster, prep the area by blasting the required spot with your stencil. Then drill & weld the bung into postion. I coated my headers black as i liked the look, so a quick touch up with VHT black paint & it looked mint.