I'm picking up an 05 legacy base sedan with a 5spd. It's a PA car so it should be federal emissions. It's got a slight knock in the bottom end. I might be able to pick up an inexpensive motor from an 06 Impreza where the right head was damaged in an accident but the bottom end "should" be ok. From what I can tell the short block assemblies should be identical but I was hoping someone on here would know for sure.

 

Thanks,

Keith

Not sure if you still need this info, but I believe they should be the same ej253 motor.  There may be some differences in electronics, but as long as you use the Legacy stuff you should be ok.  Only other thing I can think that might be different is the 05 Legacy has EGR.  I'm not sure if the 06 Impreza does, but again it shouldn't be an issue if you use the Legacy heads.