Hey guys I did a search & really didn't find what I wanted to know. Anyway since you all talk about motors & other stuff this is the only forum I thought find what I needed to know. The wife has a 95 P10 (5spd) & I was shocked to find out the car had a second O2 sensor. Didn't know Nissan started OBD2 in 95 but anyway it brought me to the question, is it possible to put in an ECU from an older P10 or an SE-R Sentra? I got a friend who has the ability to to tune ECU's. If so I'd think the harness may have to be changed too. Sorry for such a long post but I just wanted to be clear about what I wanted to do. Thanks guys!