Quote:
Originally Posted by cyclopathic
I am not sure starting when but hycam and hy Avalon have little tabs under rear bumper. Prius C has 2 tabs on tail lights and one on mirror.
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A lot of these are added after time in an anechoic wind tunnel,where wind noise was discovered.The tab changes the resonant frequency of the part,killing the noise,and very little is spent on tooling modifications to mass produce this change.
The EPA has stringent noise criteria for cars.Even tires.