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I would assume that the use of front-of-tire-protuberances, whatever anyone chooses to call them, would have to be designed for and tested on specific vehicles, like other aerodynamic features need to be.
Anyway, I have faith that Mazda put them on my car for some good reason.
I can't prove that, however.
I know of at least one guy who replaced one that went missing on his car.
Faith is blind :-)
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