Ok, so I have uploaded the blufin
Not driven it far since, but it all went fine. Took about an hour in total from start to finish.
1) down load Oem map to blu fin. Took about 15mins.
2) install blu fin software on pc (note it says win98/2000/xp only, but my win 7 was fine). In fact, this was the most time consuming part.
3) plug blu fin into pc. Add your details. New software stuff sends your map to super chips HQ.
4) I got an immediate email notifying me that the new map was ready.
5) upload new map using software to blu fin hand set. 10 mins.
6) up load blu fin map to car.
7) job done.
Car feels sharper and more alive now. Not fussed about any figures, but it's better. Will give more details once I put more miles on it for you. It's not my old impreza, but it's better!
To note, I got a k&n panel filter with the bluefin. This was the most awkward part off the upgrade.