97/98 ecu you need to swap cam and crank and also move the fuel pump wire
99/00 ecu you need to swap cam and crank
92-96 ecu require no modifications.
The map in the uk ecu runs similar boost and is a better fuel/ignition map than the pre september 1994 wrx ecu.
In Sept 1994 the z4 ecu arrived which is the best wrx based ecu for a wrx or uk.
The 6k ecu from the STI V2 was the same as the uk supplied Prodrive 'ppp' map.
Polarperformance maps for uk and wrx all used the z4 as a base map as it used the best code/firmware.
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