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I have a theory that older fullsize vans are likely more susceptible to underbody drag without a deep valence because of their flatter face causing the underbody air path to become a path of less resistance, and thus forcing air underneath and increasing drag.
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My preference is shifting from air dam to splitter. An example from Singer:
https://external-content.duckduckgo....8d9&ipo=images
It trades overall length for airflow around the wheels, but leaves a central jet.
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