I started my '06 Spirit a while ago to heat it up and charge the battery. I usually let it run several minutes at mostly a fast idle. It is in a fairly dim lit building and I noticed that the header pipe on both cylinders were getting red hot. I knew the factory jetted them lean, and that proves it. It runs good, starts easy, isn't especially cold natured, and still has the stock exhaust, even though I did add a few 3/8 holes through the baffles. Has anyone else noticed the glowing pipes?