wtf got it up to 6 stars then took off in a comet and less than a minute later i was outside the wanted area and just stopped and sat for 5 seconds until it went away
i usually just get into the subway and run away until I am outside the circle, havent been up to 6 stars yet, but I got the "walk free" achievement or whatever this way.
Sounds like you got lucky. Sometimes I even have trouble getting away from 3 stars depending where I am in the city. Sometimes with the way the roads are set up there's no way to avoid oncoming cops. I've gotten away from 5 stars but it took a lot of work. I haven't gotten to 6 stars yet.