This is car diffuser
A diffuser, in an automotive con...., is a shaped section of the car underbody which improves the car's aerodynamic properties by enhancing the transition between the high-velocity airflow underneath the car and the much slower freestream airflow of the ambient atmosphere. It works by providing a space for the underbody airflow to decelerate and expand so that it does not cause excessive flow separation and drag, by providing a degree of "wake infill". The diffuser itself accelerates the flow in front of it, which helps generate downforce.
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Diffuser (automotive) - Wikipedia, the free encyclopedia
rear diffuser - ط¨ط.ط« Googleâ€ڈ
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