Is the Legacy GT auto or manual? I'm pretty sure PHATSuby went from an auto to a manual though, so that would eliminate a lot of the work and wiring harness splicing. Also, Ben is using a BE/BH Legacy, not the 4th gen Legacy (2005). I really don't think it would be that much depending on the donor car that you're harvesting from. But it's not as simple as dropping in a new motor.