Aftermarket catalyst - quality difference?

Massive quality difference. Maybe if you get a CARB certified aftermarket it will be ok. Others will barely pass when new… and guess how they perform after that.
 
See if Rock has a California spec cat, they have more wash coat and usually have a 5 year warranty. I just looked, they have one.

https://www.rockauto.com/en/moreinfo.php?pk=11045056&cc=3315184&pt=5808&jsn=503
I also recommend a Walker aftermarket catalytic converter; however, since IOWA is a non-emissions testing state, go with the less expensive EPA rated Walker 16777 instead of the 84224 CARB certified unit. I spoke with two Walker engineers before buying a replacement cat. in 2022 for my Honda. While it is true that the CARB unit has more rare metal wash coat and a 50,000 mile warranty, Walker explicitly told me that the only way to claim the 50,000 mile warranty is to produce a certified emissions test document to show that it failed emissions testing. As such, they advised me to purchase the cheaper EPA certified cat. with the 25,000 mile warranty since I reside in a state without emissions testing.
 
*****!!! x 100000, that was savage.
Hey I drive a dodge and work on them. I see it. The "zip tie the rear O2 sensor to the frame" trick I have seen twice and it was on Dodge pickups both times.
The first time I saw it that particular pickup was a monument to backyard engineering that vehicle alone changed my position on how I felt about state vehicle inspections.
One of my buddies worked at a dodge dealer ship for 6 years, about every week he had a new cringe story about something he saw or worked on and that's at a dealership where you'd expect the vehicles to be fairly newish.
 
Update***

I suspected the Cat was still functioning, as many of the gremlins I was facing were from an elderly handicapped man who owned the car previously. After adding a can of B-12 it continues to run better every drive. I added a long non-fouler to downstream O2, and I now have ~300 miles of no codes, and nothing pending. I think she is good to go. Man, those non-foulers saved me some coin.
 
Hey I drive a dodge and work on them. I see it. The "zip tie the rear O2 sensor to the frame" trick I have seen twice and it was on Dodge pickups both times.
The first time I saw it that particular pickup was a monument to backyard engineering that vehicle alone changed my position on how I felt about state vehicle inspections.
One of my buddies worked at a dodge dealer ship for 6 years, about every week he had a new cringe story about something he saw or worked on and that's at a dealership where you'd expect the vehicles to be fairly newish.
Back in the day my mom used to always say that all the religious people drove Dodges. I didn't know what that meant but as I got older she was simply implying that that's the amount of strong faith that you needed to get somebody into one of them.
Nowadays what people drive is very similar to Saturday night's out on the local race track with the motto that you run with what you brung. I try not to worry what everybody else is doing and just try to stay in my own lane doing my own thing both physically, spiritually,etc.
 
Back in the day my mom used to always say that all the religious people drove Dodges. I didn't know what that meant but as I got older she was simply implying that that's the amount of strong faith that you needed to get somebody into one of them.
Nowadays what people drive is very similar to Saturday night's out on the local race track with the motto that you run with what you brung. I try not to worry what everybody else is doing and just try to stay in my own lane doing my own thing both physically, spiritually,etc.

I wish that was the case around where I live. I accelerate at a moderate pace, only keep 4 mph over the limit, and achieving MORE than EPA estimates on almost every vehicle I own, yet I am still at the front of the pack usually held back by those about 4-5mph under the limit and cell phone zombies.
 
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