I have a 2008 Subaru forester automatic and I've been looking into getting a 2.0L EJ20Y with a manual transmission and swapping my engine because the body of the car is in nice condition and it seems to be a fun and cheap way of getting an overall better car. I was wondering what is the best way to go about it? Should I leave them together and just put them in as one whole piece or should I separate them and put them in one at a time? Also, would I need a new ECU, and what are all the extra things I would need for the transmission because I'm switching a manual. I'm sure I'm missing some stuff but if you have done it how did it turn out for you and how much would it be overall? I really need a list of stuff i would need.