Simple enough.. ClubWRX.net: Subaru Impreza WRX and WRX STI Online Community and Forums Apparently you haven't been looking at new member's data logs recently.
These are NEW cars I'm talking about. Running the same 93 octane fuel from the gas station in front of the shop. Oil change history is moot, as they are NEW cars. Mileage is usually between 1000 and 6000 miles. The transmission oil is the same oil Subaru puts in every new car from the factory.
Sorry to burst your bubble, but Subaru doesn't build magical cars that all respond the exact same to the same tune. They're just like any other car manufacturer..