IA is really unusual about yom plates, when I first moved here I had a set of '40 CA plates on the car that lasted 3 days before I was pulled over and asked if I had made them. Several phone calls and an hr later I was free to go. I recently tried to register the car with '40 IA plates. Turns out that if your car is over 25 yrs old you can run it with any plate you want, as long as you keep the state issued ones in the car. I asked the nice lady at DOT what would happen if I was at fault in an accident and took off, as there would be no way to track me down, her reply, "oh you wouldn't do that!" Had them on the car a year now and have never been pulled over, I do enjoy the free parking!