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Originally Posted by UFO
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Maybe these "fins" are so large in order to deal with air flow from the side of the car, over the fender, reducing vortices and the wake? A little bit Kamm, a little less "spoiler." The Bonneville spoiler seems to do this job differently. Its spoiler's fins don't follow the line of the rear view window. Instead they emerge from the side fenders. But he doesn't care about trunk access.
Maybe that difference in placement (along window vs along fender) goes part way toward explaining their differences in shape and size?