The EJ series from 1.5 up to 2.5 liters, turbo and non-turbo have had countless minor revisions that I have no hope of relating here. That said, major assemblies like intake manifolds, heads, headers, other ancillary bits will bolt up. Some fit better than others. For example, a turbo header will not clear the motor support crossmember that the N/A motors use, and vice versa.
Mind your compression; match your ECU to your heads, and go easy on the boost. Build yourself a frankenstein motor.
