After a 20 mile round trip at ~80 mph most of the time, I noticed the muffler is light grey on the inside. It was dark brown/black all these months. The bike runs normal and sounds normal, and i haven't changed anything. The whole exhaust is chrome and no blueing at all. It looks like it used to look like in the old days when we still had leaded gasoline and after longer trips, the exhaust tip on cars had the same color. What is up with that???