i have one
i have one from ebay, it is chrome. it makes the bike really loud and it made mine backfire a lot for some reason. but that is about it. it sounded really good, but actually hindered my performance.
i did find out something cool though, the power tip is perfect if you want to thread the inside and make an exhaust snorkel. that way you still have the stock one if you had to being it in the shop.