I had a similar idea for a deployable airdam meant for high-speed stability that used pneumatic cylinders that took their air supply from waste air from a turbocharger (small compressed air tank could be filled externally and replenished by waste air that normally was vented to atmosphere via blow-off valve). The idea could be used in a normally aspirated car by just using the external air source (or a compressor for air suspension). It was to be manually actuated as I thought rigging it up to a pitot tube would be too ridiculous. Never ended up building it, but I did write it into one of my books, not that that's a proof of concept, but I can't see why it wouldn't work.
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