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I'm not sure that thread answers Ken's question. Those plastic flaps mounted on the trailing edge of the floor pan at the base of the firewall do not deflect air upward, they are more like spoilers for airflow under the car. My best guess is that since they are mounted in line with the heat exchangers, they are intended to keep under-car airflow from cooling the bottom sheet metal of the heat exchangers, which would reduce what marginal effectiveness they have to begin with.
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John
Yellow '76 914 3.2
(YPAF)
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