don't the series 1 and 2 have different ECU's? so if you were to swap you would need to get the matching ECU? "The most obvious change to the system was the introduction of ignition coils with built in ignitors, therefore the coil ignitor that was on previous models was not used. Other changes were, different air flow meter, engine ECU, cam angle sensor and throttle position sensor. Mechanically Series 1 and Series 2 are very similar, the only mechanical difference would be thecamshafts as the Series 2 Cam Angle Sensor's shaft that goes into the exhaust cam is slightly different. This is very important not to mistake! (early Series 2 featured the traditional Mitsubishi CAS which was later swapped for the Black CAS because of a positioning tooth which occasionally broke off)" --source Wikipedia http://en.wikipedia.org/wiki/Nissan_RB_engine#RB25