[ChrisBennet]

I played around with something like this a decade of so ago using a sensitive digital manometer. I was trying to measure the pressure difference/drop across the stock fender radiator. In my experiments I did not see any difference in pressure. :-(

I think I also tried measuring the pressure in from the front spoiler. You may have inspired me to revisit my experiments.

I put foam around the end of the hose to avoid a venturi effect from producing a lower pressure.