Abstract: A method and apparatus for anodizing aluminum exhaust housings including the utilization of conducting rods placed through the narrow passages. The rods allow current to flow and anodizing coating to build up inside the narrow passages. The rods are insulated from the housing and are connected to a special end plate. The end plate has an insulating spacer between the housing and connecting plate and ensures that the rods are installed and spaced properly and that the current properly flows. The assembly is then degreased and rinsed. The clean assembly is then placed into an appropriate anodizing solution and connected to a current source until the coating sufficiently builds up. The assembly is then removed from the anodizing tanks and rinsed in a series of tanks of increasing temperature.