Thank you guys.
Last month i read some papers about the efficiency of a rear diffuser in a sedan, wagon and hatchback. In the first two types, a proper diffuser actually reduces drag but not for the hatchback.
So my question is (hoping for your knowledge): is most effective to make a simple diffuser following the shape of the original "diffuser" with the plus of cover the holes between the bumper and tyres o make a diffuser with a different inclination size etc?
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