No.If this "dirt bike"is just a dirt bike then no it is not street legal.If it is an "enduro" style bike meaning in is a on road/off road bike then ya it can be made legal.The enduro style bikes are set on an off road bike platform but still have all D.O.T required equipment such as headlight,tail light,horn,license plates,mirrors and all the other bells and whistles associated with a road bike.