Catalytic converter removal

Hello, I am Danny.

Your catalytic converter can just be replaced using a universal replacement. The only tough spot is if you live in the state of California you have to make sure it is California certified (due to California smog laws). The exhaust does completely unbolt but why not just have the catalytic converter replaced and not the whole system? Your car has four Heated Oxygen sensors not six. A right side upstream and downstream and a left side upstream and down stream. I have attached a few pictures showing the exhaust system where it bolts to the turbo and underneath where the catalytic converter is located. Also attached a tutorial showing how to replace. Hope this helps and feel free to ask any questions needed.Thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/catalytic-converter-replacement

Thanks Danny. The right bank catalytic converter is the one showing as defective with almost equal temperatures before an after catalytic converter using a infrared gun (see one of one previous post with images). The work I planned was to replace the catalytic converter which are sold as a complete unit-both left and right catalytic converter to a "Y" see image attached. I hope this explains my question(s) more in detail. Also you can hear the rattling tin can sound when starting the car, to include extreme lost of power (in travel) and eventually a ODM Code P0240 after pulling any inclines. Not sure why most Volvo S80 T6's are are a forgotten breed, but folks like myself do not throw-in the towel on something previous owner(s) fail to do in the manufactures recommended scheduled maintenance. See attached image.

Hello again.
Yes I can understand. That rattling is the honeycomb (insides) of the converter that has broken free causing the problems. If Magnaflow makes one it will save you a lot of money! So far the most expensive converter replacement I have seen is $2,700.00. Let me know if you have any further questions. Hope this helps and thanks again for using 2CarPros.
Danny-

Thanks for all the help Danny, I replaced the unit with a Bosal Complete catalytic converter unit. Bosal was rated the better in customer feedback. It's working fine, but not 100% as quiet as the OEM, but all in all there's no leaks and the original Volvo (OEM) didn't have flange gaskets when I disassembled, as their are tapered lips protruding on the catalytic converter assembly to fit into the turbo housing and then drawn 20NM's to secure.

Hello again.

So does this mean everything is working good? Hopefully it's all going well.
Thanks again for using 2CarPros.
Danny-