Hello &welcome,not sure on the power levels I think it's based on a v1/2 impreza so mechanically it will be pretty much identical to them, if it has a shanty intercooler under the bonnet then it's a v1.
I presume it will be running at least 220bhp, could be anything up to 260 if your lucky, without getting it on a dyno it's all down to how fast it feels.
As for the map you'll get more out of it better economy hp and torque so may be worth it in the long run, I'd suggest an esl board for the ecu as.its a lot newer than an apexi standalone
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