Quote:
For Honda CIVIC 10th Gen 2016-2022
1. ...enhancing the transition between the high-speed airflow below the vehicle and the free airflow in the surrounding atmosphere.
2. Provide space for the airflow under the vehicle to decelerate and expand...
3. Does not cause excessive airflow separation and resistance (and keep driving safety).
4. Made of quality ABS material...
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1. and 2. sound like the difusser. It comes down to "excessive airflow separation" so likely they serve as fences to separate the airflow over the top and sides of the cabin. Maybe generate downwash onto the rear window?
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