There are likely to be major loom difference's. I doubt very much you can run an STi ecu on a WRX loom. The ECU have very different internal functions and this varies dramatically from year to year.
At the BHP levels we are talking about here I'd be interested to know how much AVCS would add compared to a car with the original heads. I doubt the butommeter can feel it ands it's something you will only see on a dyno plot.
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