I was thinking it could fail to work based on the location.
You were allowing air under the car and stopping it, therefore forming a pressure build-up in that area with no obvious means of escape.
On the Corvette an opening to the radiator is provided above the set-back air dam, and the engine bay is also ventilated for flow and or pressure relief.
It looked real good while it lasted, I commend your ability to try something new.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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