Don't know, don't care much. I don't really pay attention to other drivers. If it's another M3 driver I'll give them a glance to see the ride and see if they are looking. If not, I just continue on. But then again, I've only seen a couple of other M3's in this area, and it's been from around a corner or passing in the opposite direction.
Down in this area it's usually Mustang drivers that pull up next to me expecting to race. I usually ignore them completely now, even if they have a nice setup or are driving a Shelby or Boss. I'm not going to race you on the street, dumbass. Give these assholes even a glance and they think you wanna race...
If I get a friendly thumbs up or wave, I'll give it back. But so far in my experience, most people around here in Civics, Scion TC's, and Mustangs think a glance in their direction is a challenge. No thanks...
'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel