The latest updates.
I had a bad TSTAT that was causing the overheat. I took the TSTAT out, pulled the rubber gasket, and used on my old one. The old TSTAT had a slightly thinner gasket causing it to leak around the TSTAT housing. No more overheat issues.
I found the issue to the exhaust problem. It was my own silliness and lack of attention.
I remember wondering where was the washer for the nuts. Well I found them on top of the gasket when I took off the header.
Here is the exhaust pattern it created
While the header was off, I took no chances this time and cleaned it good (it's a southern thang).
before
After cleaning with a belt sander
Now down to error codes, need to pull the sensor and check wiring as both is saying low voltage.....hmmmm
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