I had my exhaust section coated by Swain. It's a light grey color, kinda of a rough surface texture, but it's not going to flake off. I just got my ATS manifold back from JetHot. I went with the 2000 coating in grey. This stuff is smooth, dark grey battleship color. They said it won't flake so I got the inside coated also, got to keep the heat spinning the turbo.
Al