Link: https://amzn.to/3ZnKP6U (Amazon 1 pack)
https://amzn.to/3EFtWLJ (Amazon 2pack)

Had a p0420 code for about 5k miles with no performance difference when code was showing. Someone I know suggested cataclean and it worked! I’m a couple hundred miles in and it hasn’t come back. I’ll be using a second run of it to clear out even more carbon. This only works if your cat hasn’t destroyed itself already.