2000 Sonata v6 p0430 code

Anyone familiar with a p0430 code on the 2000 v6 version of the Sonta? I recently replaced a couple of my O2 sensors with Bosch OEMs. I haven't noticed any noise such as an exhaust leak. Everything is driving normal (unfortunetly...lol). I am assuming my catalytic converter is bad?

If someone knows anything about this, can you please walk me through a diagnosis process? If you think it's the cat, do you have any recommendations on where I should buy a replacement?