Today I was riding and all of the sudden my exhaust got really loud. It has a brand new yoshimura rs4 and has 1 hour on it. What would cause this? Could it be that the bike is running too rich due to increase in humidity/less air? I had grey coupler/rich in because I thought that when you run a pipe you have to compensate for the increase exhaust gas release. This is bizarre. Nothing is loose or anything. I have the insert still in because I haven't had time to get a torx key set. I'm not sure if I could tell if i lost power or not. All valves are in spec and the bike starts first kick. I put the stock map back in and it was back to normal. I am a little worried about this. Very bizarre. Has anyone else experienced this?