Engine CFM times pressure ratio.
Displacement(ci)*rpm*0.5*Volumetric Efficiency (VE) / 1728 = CFM
You are multiplying by .5 due to the fact it is a 4 stroke, and dividing by 1728 to convert cubic feet to cubic cc's. I have always assumed the miatas VE at 85%. Now you calculate at each RPM desired your CFM.
Oh pressure ratio is 14.7 + boost(psi) / 14.7
So if you happen to be running one bar of boost, or 14.7 psi, it goes like this..
14.7 + 14.7 / 14.7 = 2
Then multiply 2 by whatever cfm number you got in your nifty CFM equation and that is your cfm for that boost and that rpm.
78cfm+boost= more than 78cfm