any IC" . That makes no sense at all. Freezing increases the density of the air so there is more mass going into the engine. The physical attributes of the IC has not changed to increase flow. If I have a pipe that is one inch in diameter and I a freeze it, is the diameter going to change to increase flow? At most the pipe will get smaller because might contract instead of expand. What freezing the incooler proves and is that the FMIC can support the extra mass from cooling the intake charge.