I am sure you have seen carpet dryer fans being used to provide cooling for the Top Mount Inter-cooler (TMIC) on the Subaru before. Have you wondered if it is providing too much air flow relative to “real life” conditions?
I measured the airflow speed out of the B-Air Grizzly GP-1 carpet dryer fan (the green one in the picture above) and it peaked at just under 90kph. This fan is one of the most powerful one that I could find, with a 1 hp motor and a flow rating of 3550CFM.
Given that cars on the dyno are usually run to 140 to 160kph, I would not consider the amount of airflow being directed at the TMIC to be excessive.