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I tried a number of things, none of which made a meaningful difference in the airflow through the heat exchanger. I am not willing to cut up the body on the car. So, airflow is what it is.
For posterity, some of the alterations. The tire spoiler is the only thing that had an effect, maybe +5%, but it is hard to be sure as there is lots of noise in the data. Scoop for the oil cooler Lip on leading edge of fender Tire Spoiler front view Tire spoiler from inside wheel house