Hello everyone! I have a EUDM 1997 impreza GT (those have a 155kw ej20g engine). My engine has died and i was searching for a new one when I came across ej20h twin turbo for a nice price, so i thought i\'d give this swap a try. So I basicly have everything i need, the question that bugs me is the ecu/cr/detonation thing. I have my stock TD04 turbo and ecu. The cr of my old engine was 8.0:1 if i remember right. Do i really need a new ecu? Also would I be able to reduce the cr to 8.0:1 by just using my old pistons from ej20g?
