I may have found my issue, as I was investigating the problem of the discoloration, I did find a noticeable dent on the pipe that goes with the piston that has the light brown. Have no idea how I got that. I'm guessing dragging at a track some time ago that had large clunks of clay and rocks. At idle it definitely has less smoke and ping than the good pipe side. While revving, they both feel the same. So would this play a role in the discoloration? Sent from my LG-D722 using Tapatalk