Join Date: Nov 2013
Location: Central Iowa
Car: 2004 Outback Wagon, 2.5, and auto
Feedback Score: 0 reviews
I am in the same position you are, I bought an 04 with a broken timing belt and now I am trying to track down parts for it. Here is what I have figured out, hopefully someone will correct me if I am wrong.
If you have a federal emission spec car there is a change between 00-02 and 03-04. 03 and 04 have a egr head, different wiring, and a egr intake manifold. To use the 01 engine you will have to swap an egr head onto the drivers side and use your 03 intake manifold and harness. Everything else on the long block should be the same. Not too bad, you will probably want to put head gaskets and a timing belt kit on it while the engine is out.