as was explained to me by some top drivers in the world at the Reedy Race of Champions last year, the extra body posts in places are to keep the bodies from deforming while driving at very high speeds.
lot of the time bodies will deofrom under wind resistance and develop pockekts, and places for the airflow to get trapped.
the most common i can think of is where the hood turns into the windshield, a lot of the time the body can flex at this crease in the mold.
(wish i was a good enough driver to be able to tell if my lap times were tenths slower because my body was deforming under high speeds!)
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