Saw an AW M3 on either 520 or 405 (lol forgot) about 2 days ago in Bellevue. Driver definitely looked familiar, I think he dyno'd his M3 at one of the dyno meets that I went to and I happened to film his car:
Also went to the BBQ meet in May at Alki.
The driver gunned it to the HOV lane when he looked back and saw me - I was in a silver '09 A4, test-driving in the passenger seat.
M3 sounded AWESOME!