Will this fit?

[jewbaru]

http://www.jdmenginedepot.com/jdm_engin ... /_Sandrail (http://www.jdmenginedepot.com/jdm_engine_details/141/Subaru__EJ20_Legacy_B4_RSK_/_Legacy_GT/_Sandrail)

Will this replace my ej25 in my 04 legacy? Or are the trannys etc different?

[anothernord]

That's a turbo EJ20, so the ECU and wiring are not the same. You'd have to swap harnesses and ECU's.

All Subaru transmissions bolt to all Subaru EJ engines.