Hi, 

New to the scooby scene and just bought a V3 STI which is fully standard, What mods can I do to get more power without changing the ecu? I believe you cant map the V3 STI's?

You can map the ecu's it will need a piggy back or daughter board grafting onto the ecu

Have a look at esl www.enduringsolutions.co.uk

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Had a look on there but doesn't seem to be any on there 

Here you go

http://www.enduringsolutions.com/shop/#!/Board-92-6-Optional-discounted-cable-and-software-available/p/33042553/category=0