P0420 code for cat with this noise

So...im getting this noise around 3200rpms...i habe the p0420 code saying I have a bad cat...what say you all?

https://www.dropbox.com/s/nzmv6s5sp7q6ulw/20180415_215019.mp4?dl=0

 

Sounds like a plugged cat!

 

Do the exhaust manifolds seem to go bad on our trucks regularly?

 

Only if they have a cat welded to them. The monitored cats are a weak point on these trucks. They usually fail at about 180k or so

 

The cat or the manifold? I would think the manifold would last as long as the engine so long as it does not crack right?

 

Check the donut gaskets where the manifolds connect to the y pipe. I had that same code and found some soot, indicating a leak at the above mentioned connection. Gotta loosen both to replace one.

 

The manifolds don't go bad but the cat does.

 

Yes in theory they dont...im asking if there is a history of ours ever cracking on the 2.7L engines.

 

It's possible, though not common.

 

So...got the money now...im going to buy a cat from rock auto...of those on there which do you all think is the best quality? They are all priced roughly the same.

https://www.rockauto.com/en/catalog...1,exhaust+&+emission,catalytic+converter,5808

 

BTT

 

Bosal

 

Well...i guess most of us just don't run a cat when it goes out.