When the cats are off, have a quick peek down the exhaust with a torch or a cheap ebay keyhole cam if possible to check for pieces of cat that may have gone further down. What I found on my D2 when the cat failed it sent pieces down the exhaust which got trapped further down. Luckily they were only small and didn't choke the engine but made a heck of a rattling sound.
Good luck I hope the fix goes well.
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