guys, need some real advise here..badly..im kinda confused..at the moment im driving a iswara 4g91...my friend is selling of his 4g93 parts..the parts that he is letting go is 4g93 block,4g93 head(engine kosong la) and the ECU(not together with the wiring)..

1) the question is, can i use the 4g93 ECU in my 4g91 wiring...Can i modify my 4g 91 wiring to fit in the 4g93 ECU or i need to get 4g93 wiring...

2)what is meant by port polish?is it done for the head alone or together with the...