As I posted earlier, I am looking at getting a used Monster (SR4s most probably). Many have had the frame stickers removed (and gone)) for appearance sake, which is fine. But my question is, does anyone know if retaining these somewhere on the bike is necessary for legal reasons...particularly in Calif? I know that the VIN is on the frame elsewhere. I think these are "sound" and possibly "emissions" stickers...but I really do not know. Thanks for any help.