Originally Posted by jaimebenlasnow
Im not too sure about this, EJ20G had everything forged its close deck etc.. so using some wrx piston wouldnt really make this motor as good as it is..
Not true, on several counts
Only really early Ej20G's(like 89-91) or STi's(up through 1995) were closed deck. 90% of them were not.
Only STi versions ever got forged pistons.
All Ej20's from 1989 until present have forged cranks and rods. There's really not one that's better than the other.
I personally wouldn't put an Ej20G block into an '04 WRX. For the money one would spend building an Ej20G to make it appropriate you can buy a brand new crate Ej25 bottom end.