O/k let's assume 1,000 BHP at the wheels.
That is around 1,176 Hp at the crank.
Maybe 1,764 CFM of airflow going into the turbo, that is 2997, say 3,000 cubic metres of air per hour.
Looking at the Eaton flow map for the M112, the supercharger may have a volumetric flow capacity of (guess ??)...