| Unless a company tests their wings in a wind tunnel on the particular car that they're designing it for, they're not going to be able to make a very effective wing. Most wings are for looks and nothing else. Especially on cars with high cabs, the cab obscures the windflow from the wing so it won't be very effective. Take a look at racing cars that have actual functional wings. Look at the size of the wing and the speed those cars go. Look at how the air flows undisturbed over those wings. Those wings are designed for the car they're on. When you see a company make a "one size fits all" wing that is supposed to work for all these different cars of widely varying shapes, I doubt the legitimacy of those products.
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