A lot of us in Norway drive with these mods:
in addition to the list below i would add an Oil Cooler and rebuild the bottom end...
check out:
http://www.horsham-developments.co.uk/
The stage 3 chip is designed to optimise the fuelling and ignition for an S13 with the following modifications:
Free flow air filter
Free flow exhaust
17psi boost pressure
Uprated intercooler
T28 hybrid turbo
Uprated fuel pump
444cc injectors
Z32 AFM
The chip removes the fuel cut and, in conjunction with the upgrades above, will allow the engine to produce in excess of 300bhp.
The stage 3 chip will only work with 444cc injectors and a Z32 (300ZX) air flow meter (AFM).
A power graph will be posted shortly. I have had one power run with the chip and achieved 300bhp but this was in extremely high ambient temperature (>40 degrees C!!) - I will be obtaining another power graph with more sensible ambient temps.