-the effective square inch area of a 90mm throttle body would be about 8.5 square inches.
-from testing I have done at 25" of water test pressure----I'd suspect about it would flow about the same as typical race prepared ports that I have measure to flow between 96 and 126 CFM per square inch.
-so this would 816 to 1071 cfm.
-in comparison I have found a variety of sharp edge orifices to all flow flow 84.4 CFM per square inch----and a variety of simple venturi shapes about 3.5" long that all flow within 200 to 209 CFM per square inch.