2018 SR5 premium side mirror question

[Kokoman78]

Anyone have any ideas as to what those 4 little bumps are on top of the mirrors??

 

[Xhado]

They're there to increase aerodynamics and disrupt air noise.

 

[Kokoman78]

That's it?? Those little bumps to increase aerodynamics? ??

 

[philsey]

Yup. First iterations of those mirrors had wind noise.

 

[StuckInTheBurbs]

Mine seem to actually create wind noise

 

[Frederick1]

They increase gas mileage!lol