Don't call it EGR cuz EGR = Exhaust Gas Recirculation, and if the gas isn't getting out of the cylinder in the first place, it ain't recirculating!!!
I get your theory by the way. The fact is neither of us know exactly what is happening in the cylinder.
"...and since the flapper is increasing the amount of exhaust present in the cylinder during warmup I would say it's increasing EGR."
You don't know that.
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