My current bike, an xl250s seems to have a peter allen power pipe, I have been trying to find info on the net about these pipes, but i cant find any. I have seen them before on various bikes(mostly honda and kawasaki's) Here in Australia.  If anyone knows of any links for info, it would be greatly appreciated if you could send them my way. If you have any information, or any personal thoughts on these pipes, i would love to hear them.