Thanks for the reply mate !! I know there are few different options out there but it all comes down to the cost of goods and installation then of course tuning. Nistune works out cheap even if I did it using a RB20 ECU, but the question is does this setup work on R33 S-II. I heard it works fine on series I cars coz the ignition is same in RB20 and RB25 series I.
Other option would be to find a 2nd hand PFC…