no still using s1 coils. everything on the car is still series 1. the only thing that is s2 is the bottom end and head with the s2 cas. both manifolds, turbo, coils, air flow meter, ecu and everything else is s1. i don't think my mate would want to swap everything over to s2 just to run his car, eg coils, airflow meter, ecu etc. that would be alot of stuffing around and a waste of money. it would be easier to just swap exhaust cams over so that it can run the s1 cas, but i want to know is there an easier way? on another note are r33 s1 and s2 power fc same or different, because he has a new power fc ready to go (don't know model number) in after the motors run in. i wasn't game enough to plug it in and see if it would start.