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Interesting.
My old rubber apparition aerocap (17 degree slope no boat-tail) was not far from their optimum. (25 degree slope, 10 degree boat-tail).
The diffuser did not appear to be that big a deal.
Some of this echoes aerohead's practical experience with his boat-tail pickup.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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