96 MY STI RA ECU FIT 93 MY WRX
#3
It would be a definite nono for me. The std engine may not be able to tolerate the temperatures that an STI block is subjected to. Also, the UK does not have 100RON pump gas, which is the main problem with running an STI there...
#5
Can't comment on the STI ecu but I have been told that a standard MY95/96 wrx ecu is a big improvement on your model (same as mine but not changed my ecu yet) and I think there is an improvement in power as well as they had 260 bhp rather than our 240. This is just what I have read in the past and NOT tested by myself so seek further advice if your interested
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