only trouble with buying a b-reg car and swapping parts over you still have to provide evidence of intended motorsport use for one car, chiefly a roll-cage. this is where the half-cut(s) become the easiest way of converting your wrx or adm sti into a jdm model. decide on the model, get someone like jws to import the two halves for you, carry ou the conversion yourself or pay a subaru workshop to do it for you.