TGV's/EGR's and pre-metered Air

Hello, so I am curious on how to adjust for removing TGV's/EGR's? If the MAF and MAP has already measured air coming in, but the TGV is being opened/closed after the those sensors - whats the best way to adjust AFR, compensations, timing, etc? I realize the wide band is still the best way to know what AFR you're at, but when you're doing math based I am curious if there is formulas for TGV's (increased airflow from the lack of butterfly valves, i.e they say 40% restriction is removed on WRX's *roughly*) or even EGR's (is there a way for us to calculate how much gas is being recycled and the effects of that gas when being mixed during combustion?) Or is it all trial and error of adjusting timings until you knock or hit MBT?

If it is trial and error - would it be unwise to attempt to tune out EGR/TGV deletes without a dyno?

Apologies for the mess of questions (just a noob trying to learn).

Thanks!

So as far as the TGV goes, this is essentially compensated for automatically by the MAF. As the TGV closes it restricts airflow into the engine but of course the measured airflow tells the ECU exactly what is happening and hence the correct amount of fuel is provided.

The same really goes for EGR as the introduced exhaust gas displaces fresh inlet airflow and reduces the metered air passing through the MAF.

Ahhh! That makes total sense. I didn't think about the pressure dynamics - and EGR is never active during higher loads, so awesome!

Thank you!