I'm not sure where everyone is but this forum seems to have gone dead-ish!
Watch out for the tumbleweeds etc.
Hopefully someone will be along to help shortly.
The fuel/timing/Ignition advance maps seem to follow a pattern, so maybe the Twin turbo stuff will be after that..
Have a hunt for "Free Hex Editor Neo" on Google and download that to get started, it will allow you to see the raw code in hex.
I tried to use Evoscan on someone's GTB the other day and for some reason it did find the ROM ID and connected, but it never captured any data using the default parameter addresses. I think his was a 4G as well.
So is yours a Mines or something? Any special stickers? Can you post up some pics of it perhaps?
What year is your legacy? Is the ECU still factory fit (Except that its been modified) or an replacement one, being a different number? One way to find out is if you open your glove compartment box, have a look on the left hand side of the box itself, there should be a sticker there with some numbers, can you post them up (If the sticker hasn't been removed)
For the fuel map, Since it was the same for Bretts ECU as well as My ECU and Phils I'm hoping the GTB has the same addresses Take a look over on this post here at this thread:
http://www.subiesmart.com/forum/index.php/topic,43.msg385.html#msg385Cheers,
Daniel.