So I'm graduating with my MA next year and will prob. have to move to California, so EJ20G in OBD2 car is prob a bad idea. How difficult would it be to rewire my car from EJ20G to EJ257? I know the 257 has AVCS+modern crank sensors/diff. intake manifold, but would it be a matter of just replacing all of the sensors, or is it more involved?