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these could work. sizing number and placement would be critical and the gains would be small but should be measurable DEPENDING on your car's shape !!
I used vortex cuts in my Co2 cars to shave several hundreths of a second off my time trials they worked measurable (in co2 cars hundreths of a second are HUGE!!! cause me to jump 17 places !!) by helping to fill in the base drag vortex behind the vehicle once the co2 was expended.
if we can get them cheap enough it makes a "why not" scenario. :-)
what we really need is someone to get ONE of them and make an STL file of it then we can just 3D print more at a fraction of the price.
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