In order to prevent airflow from the inside of the baffling from escaping to the outside by passing through the cavity under the inlet ramps, I have decided to seal the inboard ends of the ramps.

1. Measured the cavities and cut some rough plug shapes out of 1" foam.
2. Used a coarse, flat file to shape the plugs so they would fill the holes, with about a 1/16" gap all around.