I would contact AJ Waggoner, he has been on here many times and has stated that he would sell us pipes, I have purchased one myself with no problems. AJ is the guy behind the AF conversions, talk to him.
If you have the capability, Jonny is right, the pipe is nothing more than a CR500 pipe with a KX manifold. I modded a Pro Circuit CR500 pipe for one of my conversions.