Aero can make a difference at any speed as long as the win is big enough and positioned correctly.
I watch a lot of oval motorsport, and even on short ovals people scoff at the effectiveness of wings.
Until you talk to a driver and they tell you how different it feels if they damage a wing and can't run with it.
They can adapt of course as the feel is only part of the racing in a contact sport on a low speed oval on dirt.
But even in the mid 90's when they were running F1 cast-off stuff wings at the back and splitters at the front it made a difference.
Aero has been in rallycross for a long time, just at varying levels. Schanche. Jernberg, Eklund were all running old F1 car wings on their cars in 95. and major splitters etc up front.
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