Just want rid of this now, back box alone is worth £50 surely. Centre pipe would be fine with a few little spot welds or some decent exhaust silicone/paste/putty. You could just grind the decat off if you didn't want this and sell separately.
https://www.ebay.co.uk/itm/332624683901?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649
https://www.ebay.co.uk/itm/332624683901?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649