The GT-B is a further enhanced version of the GT Legacy Wagon, the "B" in the name referring to the Bilstein struts that the car was equipped with. The E-Tune II was introduced in 2001 as a 2002 model. Vehicles with the Bilstein shocks had a small Bilstein badge attached to the rear of the vehicle, below the "GT" badge. They featured some different interior options, larger brakes and wheels, and more.
Source: Wikipedia (original)