================Hope this may help most of everyone on here
I had same issues with my 2018 SE and thought no resolution would ever come, checking mirrors, taping off the seams, holes gaps everywhere on car, found out none of that resolved issue.....
issue was on the front windshield molding that runs up pillar. there are clips that are veryyyyy flimsy and can only guess if improperly installed from factory or whomever, glass guy, bodyshop
they will fail to hold molding.... where it makes molding lift at over 40mph, allowing air underneath. check your windshield molding if your having a whistling sound. you wont think anything is wrong with it because it's still flush as normal under visual inspection. I attached some pics as well. after clips were reinstalled sound went away instantly