I did leave the secondaries plate in there because this manifold would suffer torque loss from low to mid RPM
due to the length and volume of the runners without the middle plate.

It would be better to get and aftermarket IM and tune, than to just remove the IABs.
However, every single butterfly hole has been ported for increase airflow.

I haven't actually purchased any tuning system yet, but long-term reliability and price is a priority,
which means that I would never consider squeezing for this project.

Edit...Found a picture of what my IM & IAB plate looks like now: