Well, Im not too sure of the legaity of it. However, I feel that if you put an amber bulb in the placeof the stock clear one, everything should be fine. I never had any problmes with it on my Civic. I even had a clear turn signal bulb in it for a long time.
Doing it isnt really too hard. Take the headlight out, heat up around the edges where the clear lense and the housing meet. Gently pry the two apart. Once apart take out the amber peice. I havent looked at our headlights yet, but I assume that its just the same as all other HOnda headlights made in recent years.