I not sure in seg but,i'm using st183 convert 3sgte.most chop shop have gt4 half cut come with no rear excel so cant use d 4wd,so i put in mr2 gear box but must modify the gear mounting,drive shaft and d toughest is gear cable.can't imagine d power after put bov,metal head gasket.can eat 1.6 20v like kacang.