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rear wheel covers would help on a full bodied car, like the above pictured. The drag bars are aero in their own way, they are a thin as needed to withstand the forces, and they are round. Traction is more important then aero. Thats why drive wheels are fat, and steer/coast wheels are skinnys. If they were to enclose the drag bars, that could throw the entire chassis setup way off. So i'm sure they've tried it, just not enough.
If anything, how about someone with a Kammback or any of the aero mods that are removable, spend a day at your local 1/4mi on a test and tune night. I guess i could with my truck if i had a tonneau cover and could rev my engine past 3500 rpm without fear of the problems just exploding i would.
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Randy
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