Yeah I know the Haltech is not plug play...much better off just getting yourself an STi 2.5 turbo motor and putting that in. Won't break a sweat hitting your power goals
that, and not all Haltech's are plug and play for the older EJ engines
The tune is not a problem..If PR has emissions tests you will have to consider that too.
You also need someone that knows how to properly tune the Haltech.
Next up is you need the complete wiring harness for that motor, and its an auto so maybe keep looking until you find one that comes with a manual transmission too.
I can see your IP
you will still need the wiring harness, just not the ECU. Haltech does make some plug and play harnesses. I know I have one for the V3 STI.