Catalytic converter question

[blackout51]

So I just got a p0420 and I know it's not my lower o2 sensor because it is brand new and my code reader is showing that it is working. The two o2 sensors are reading both a high then low then high and so on reading so I'm not sure if that's any indication or not of a bad cat. Basically if it is a bad cat what should I do as far as replacement, I've heard that universal cats can cause you not to pass emissions. If I were to get one I'd probably go with a magnaflow one unless I should get one that's already built into a pipe setup.

 

[ConeKilrAutoX]

I'd probably go with a magnaflow one

I got a 3" magnaflow high-flow cat when I did my after market exhaust. Works Great.

 

[blackout51]

I got a 3" magnaflow high-flow cat when I did my after market exhaust. Works Great.

No problems with emissions or cels? And how does it sound?

 

[ConeKilrAutoX]

I have had no problems at all with a CEL or inspection here in PA

as for sound I believe it is good but I can't tell too much because my flowmaster muffler drowns out any sound it would make.

if your replacing it on stock piping it is 2.75" I believe.

(my setup is custom with 3" piping to the muffler and dual outs that are 2.5) here is a picture of the cat in my setup
View attachment 26337

 

[blackout51]

I have had no problems at all with a CEL or inspection here in PA

as for sound I believe it is good but I can't tell too much because my flowmaster muffler drowns out any sound it would make.

if your replacing it on stock piping it is 2.75" I believe.

(my setup is custom with 3" piping to the muffler and dual outs that are 2.5) here is a picture of the cat in my setup
View attachment 12295

Which flowmaster? I got a 50 series SUV one I've been waiting to install, guess this is my chance

 

[ConeKilrAutoX]

I believe I used the super 44

I like the sound and the drone but if you dont like drone dont use one haha

 

[blackout51]

I believe I used the super 44

I like the sound and the drone but if you dont like drone dont use one haha

My last car was ridiculous drone which I didn't mind since it was a mustang but I want loud good sound but not crazy loud. That's why I figured the 50 SUV series would be best for me, we'll see. But do you have a part number for your cat?

 

[ConeKilrAutoX]

I dont Sorry it was 2 years ago but it was just a highflow 3" magna flow cat.