Getting 0420 cat code. What's successful after market cat & o2 sensors? Read this somewhere but can't find now. Found several diff. manufactors on Rockauto...Thanks!

 

Aftermarket tends to not last as long. Don't buy the cheapest CAT.

CAT choice will depend on NY, CA or federal emissions.

 

I have bought three cats in my life and all came from NAPA. They came with a lifetime warranty and installed and worked perfectly. Not the cheapest out there but just my two cents. I do think that a factory cat would be the best but it is the most expensive.