When escaping the police during Snow Storm (I think you get 3 or 4 stars, instantly) I took down some officers which gave me 5 stars - jacked a car and cleared the crime scene - raced down some road until the end and discovered on the radar that the wanted circle border was really close. I hopped out of the car (or did I exit through the windshield? can't remember) and climbed a fence or so to then hide behind the next building - the chopper guys didn't see me down there so I went on and finally evaded the 5 stars wihout further attraction.