Anyone recognise this exhaust?

 I own this exhaust,it has no markings and iv always belived it was a custom made piece, it came with a few bits a while back, its well made, stainless steel, the manifold pipes fit into the exhaust with exhaust springs. Im fitting it to a bike in a few days as i like the flat bottom for Irish roads and speed bumps. Anyone can shed any light on it, would be awesome, thanks as always in advance.