They are for increased rear downforce, therefore more stability. Also drivers have noted that it seems more controlled in mid air and easier to pitch. They do nothing at low speed, just high speed; the idea is it splits the airflow into 2 clean paths, rather than a big turbulent mess over the shell, which means that in theory more air will be channeled onto the wing. However, if the fin extends over the rear wing, around 3% of the wing would be stalled, making it worse effectively. I will not be using a cab forward, but the kit rear cab shell. I am doing this to see A) if it works B) if there is notably more downforce or stability, how will the fin size/positioning affect this.
EDIT - the mandatory LMP fins are to stop them flipping if they spin sideways, similar to what i'm trying to achieve with this - it isn't about the front aero, but the side, which makes me think what the guys running these new shells are telling us is true.
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