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you can reduce frontal area and therefore your Cd
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They are two different things. It would be similar to taking the fenders off and running open wheel. Especially if the side windows are down, then the pillars approximate round tubes — more drag.
Tonneau covers and teardrop headrests are traditional. My example would be Bombshell Betty, windshield but no side windows or back window.
1952 Buick Super Riviera “Bombshell Betty” for Sale | Cool Material
When I saw it it didn't have that weird spoiler under the not-window, but it did have a fence in the diffuser.
