^^ $575. That's how much the pair of CATs cost from the dealership. I was unable to buy them online at the much lower price of $213 and $207 for whatever the reason may be. One vendor had a dumb policy of "we can only ship to your 'ship-to' address if you buy through PayPal" I gave them the middle finger on that and told them I'd buy elsewhere for more money if they didn't accept my VISA as payment, which I did. I bought front and back because I'm of the type of mentality that "If one is bad, the other one probably isn't too far behind".
Anyway, I found the answer to my question above with torque specs on the CATs / manifold. 18lbs on the nuts.
Also, I'm not sure why Ford didn't just use bolts instead of studs for removing the manifolds. I had two of the studs come off on the rear head when I removed the original CAT. It was rather annoying to have to separate the stud from the nut and then reinstall just the stud before being able to continue. BTW, the studs are 5mm.
Pictures of the old CATs
The front one just had buildup of stuff. The rear one had damaged honeycomb material. I'm not sure exactly why P0430 is considered "failed" if it looks fine? I guess the car's ECU knows best, right?
All said and done, the job was relatively straight forward. The rear CAT was a little more difficult to work with as about 95% of that part of the job was under the car. I had to remove the upper intake manifold to reach a few of the bolts and the primary o2 sensor removal. Unless anyone here knows of an easier way to access that top end hardware for the next person that needs to do this, that is what I did to make that part of the job happen.
I also ended up replacing the air filter because it looked pretty dirty.
And the car now has 99,2xx miles and the cabin filter has never been replaced. Yea, I replaced it as well, lol. The old one was rather disgusting!