There are videos on YouTube, showing people pulling their cars by pulling on a spoiler affixed by 3m.
No one is claiming these eBay spoilers, diffusers, etc are to add aero.
If someone was 3m-ing a roof rack onto their cars, different story. But let's be real, these are spoilers that weigh nothing and do not even come close to the max capacity of 3m tape. if you are the type to add real aero you probably also mind a few screws through your car.
IMHO.
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