cool thanks mate, if thats the case the CM5A/CE would have came with two different ecu boards the metal case cant be touched but ive written the definition file to edit the plastic case ecu's id be happy to help you or your tuner if you need it
evo 1-3 head will not fit a 4+ block water and oil galleys are different
and just to correct an above comment the evo 5+ blocks do not get crank walk its impossible due to trust washer design
if the ecu is a plastic case ecu it can be tuned fairly easy, i am still unsure on what a CE gsr is as we dont have them over here we only have a CD5A and a CM5A