I would think the double walled pipes were done that way so the pipes wouldn't be blue. I am also assuming the bike really wasn't designed to run so lean or have all that extra stuff on it. I, also, don't want my pipes blue.
I'm not sure if you can get all the blue off (if bad) even with some serious power buffing. The pipes turn golden before they blue. The "golding" can be removed fairly easily. I have used Semi-chrome on any golding since the bike was new and never got to blue. 9K miles - like new pipes.
