well in cali it is really really strict,..in ohio,..both my cars are swapped,..i didnt say nothing about having a b20 or LS motor in the cars when i registered,..they just asked for my title and liscense and that was it,..i know in cali you have to have a new motor then the body of the car,..for example,...if you have a 96 hatch your motor has to be 96 and up,...smog is strict over there,..good luck