Oh great, thanks, I could see if I find someone that can do that for me. That would definitely save me a couple bucks, even though as a general rule I have a no-expenses spared policy on this car.

 

When my muffler started rattling I used some wheel weights, and that helped.

Eric the Honda car guy gave me the idea.

https://youtu.be/-tzQclY43IA

 

A modified o2 spacer can be used to pin the cat media in place and protect the sensor at the same time. It will also forever prevent code P0420. Think it through

 

Quick update on the issue, we took off the catalytic converter and we found that the tip of the O2 sensor came off and was rattling inside, and the cat media is loose inside as well. We can confirm it's a bad catalytic converter.