I don't think air will rush into the wheel wells to flow out the back, the cover suggestion is to smooth the flow across the rotating wheels. Also, having it open at the back will be quite messy in rainy weather. The wheels would toss all that grime right up on the side window and corner of the windshield.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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