Ok, here's an update: I just chat with the guy who owns a Benelli BJ600GS and he got fine 200rmb, minus 3 points on his driving license for driving with a 沪C license plate in dontonwn Shanghai. It his first fine since the beginning of the year and apparently, the losing points thing depends of the the zeal of the cop. So it's not an urban legend that you're losing point driving outer ring license plate in Shanghai, it's just a question of luck.