I have several exhaust back boxes for Sale
2 of them are currently on a duplex system of my old impreza. I can split them no problem or if you want both back boxes your welcome to the duplex pipework.
The two are 5" and the blue is a 4 inch letterbox. They come as you see in the pictures with universal hangers and spark plugs drilled into them for adding a flamer kit if needed :cheers: