Hello I had one done by Mick Andrews in 1989 on a white framed ty250r. He also put on a hand built silencer and altered the porting. The capacity wasn't altered on my bike as it wasn't very old when I had it done. I've seen similar silencers on eBay since. They were sealed unitis made of alloy that you'd have to cut open to repack. At the time all the ones that he converted had these silencers added
