The backbox was a right pain - without a neighbour lending me a grinder to cut the welded bolt off I’d still be under it with a junior hacksaw just now!
Think I might replace the center pipe over the summer as well as the flange was rotted away a good bit - means taking off the center pipe, cutting it below the cat, and sleeving over the replacement - not a difficult job at all. The hole in the down [ipe I’ll put an exhaust bandage over with some gun gum then on top of that a section cut from the old backbox, jubilee clip it on and some gun gum to seal it up.
My backbox “journey” Sportex Exhausts (backbox) - #17 by Mike-McD