Hello folks. The name is Skyseeker56. I ride a 2007 Victory kingpin tour bike with the stage one exhaust installed. I bought this bike in the summer with 19000 miles on it. At idle, the bike is making a noise that I can best describe as a flap or valve opening and closing rapidly. This sound goes away as soon as the trottle is increased but comes back as soon as the bike is at an idle again. This is a very annoying sound loud enough that anyone near the bike can hear it at idle. Any thoughts on this noise folks? Any thoughts you may have would be help fugure this out.