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thoughts
*i think the upper extension could 'frustrate' the turbulence a bit,kinda forcing where it could or could not go.It would be hard to attach a numerical value to it though.
*as to the lower panel,I think that it would just be embedded within the turbulence that would already be present back there.
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*Without a complete belly pan and diffuser, the underside of the lower panel would have no 'sink flow' approaching it with which to modify,just the turbulence which would begin under the nose of the truck,reaching all the way back for hundreds of feet.
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