janspeed back box mgtf

hi all, i have had a wasp sound in the exhaust system for a while so have had it checked out today, the say the exhaust is breaking down inside!! gutted as its a stainless steel box,, so here goes, any idea how to fix or is it a throw away and start again, if start again has anyone got a spare sports rear box in good condition sat in the garage looking for a new home and if so how much?? thanks in advance steve

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