Is there a M3 wave like Jeep's do?

[Slowphiveo]

I flash a turn signal, since they are rarely used.

[PhatLyfe]

when passing a G series, I just roll up the windows.. Fellow F8x's get the blinkers or flash from front lights.

Often getting biker in race bikes, pulling up next to me saying I have a nice clean look car (White F83)

[BlackF82]

Out of all of the M3's and M4's that I've ran into (about 20), about 2 or 3 nodded and the rest don't acknowledge. I decided to do the same, not even recognize I see them.

[uncle ben]

You use your indicator in the direction of the other m driver. That is the one and only time you are permitted to use the indicators. Otherwise it’s just hurried last minute aggressive lane changes and tailgating 99% of the time.