You drive an import mate, get used to it. To be honest, I'm surprised I havent been done yet. My exhaust is obviously too loud, among other things.
My mate (Hoony on here) was done on a cruise. His was the most stock car there, was doing the speed limit, and co-operated fully with the police. Still got a sticker.
Point is, if they want to sticker you, they will. Its there was of "saving lives". Good luck with getting it off.