I was considering a piece with louvers cut in it for that reason. that would also actually create a bit of suction to help remove the air from the tunnel.
Looking again a the drawings, I'm not sure that a parachute effect is the issue. There should be plenty of room for air to escape from the gap left aft of #4 for the front suspension.
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Driven: 2010 VW Golf TDI
Driven less: 2001 Audi TT Roadster (225)
Parked: 1982 VW Jetta Diesel
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