Recommended Aftermarket Catalytic Converters

Hey all,

I've got a 2021 4cyl., the factory cats were stolen. Dealer was saying 6+ months for a factory replacement, so I ordered a cheap direct fit off eBay and put it on. Also had to splice in a new wiring harness for the O2 sensor cause they cut that off. I'm getting a P0420, which I understand to be because the cheap cat isn't good enough. So, does anyone have a recommendation for a better aftermarket cat that my truck will like? Maybe a Magnaflow (and which one, as their site doesn't get any results for my truck)? RockAuto has one from AP/Eastern that's direct fit, does anyone know anything about those?

I'm moving soon and at this point just need to sell the truck, but I want to get rid of the P420 first.

 

Test pipe and URD simulator.

 

Unfortunately I don't think URD still sells that simulator. I had one on my old 2nd Gen so that was the first thing I looked for.

 

Depending on how much the 'cheap' unit was, you might consider putting 2 of them end to end (as close as you can) and that MAY fix that code. It's a matter of efficiency with enough reactants to do the job. Just a thought.