I finished the exhaust. One of the things I did is weld the muffler onto the headers and try to get the muffler to muffle. Worked out pretty well, it's loud, but not too loud. Really like the noise. Don't worry about the smoke. I sprayed oil inside the exhaust to prevent it from rusting from te inside. It should be fine (I hope) once covered in sooth after riding it for a while.