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I guess there is no way to know for sure then or figure out why the spark advance number is what it is.

Has anyone noticed that some of the spark advanced values logged don't match what is in the borderline/mbt spark tables? As an example, I would log a spark advance of 12.5@2000 RPM at a load of 98%...

When you say stock headers do you still have cats? The 15-17 GTs are different and have the cats built into the headers. I was asking specifically about cars without cats.

so In order to enabale readiness for the rear o2 sensors in a car without cats/aftermaker cats, I would just remove the DTCs for the rear o2s and drive it for 40mph for 4 miles? I could try JN2s...