Mirror Wind diffuser
Could see if someone can 3d print some for the mirror housing themselves, or the a pillar. Other option is a b-pillar type design like this? But with the seats that would be really hard.
http://www.hardmotorsport.com/hard-m...-pair-bmw-e36/
Experiment with size and placement ether on the door or mirror inside edge..
I did his on my old 991 Turbo S











