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You could but remember the WRX ECU's are set to run on higher octane fuel (100Ron) - the only ECU which I would consider 'safer' is the Z4 which still is of JDM origin so the fuel used should be at least optimax
A UK ecu runs the same boost as the JDM ecu - 11.47psig (appart from the odd few - Z4 = 12.71psig etc). The major difference is the amount of ignition advance they run as they are set to run on 100 RON fuel