Not Ranked
There are a lot of good spun aluminum ones available through Circle Track suppliers. The Corvette one has too many protrusions & bumps that would ultimately inhibit the air flow. I think you are attempting to fit a 9" drop base into a tub thereby resricting any percieved improvement. Make a choice, good aiflow or originality?
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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