The GT is a tuned version of the Legacy Wagon, using 2.0l twin-turbo engine.

USDM GT
The USDM GT is a trim model that featured larger brake calipers than the standard trim, as well as simulated wood interior trim.
The engine is the same 2.5l naturally aspirated EJ251 engine found in the standard trim.

USDM GT Limited
The GT Limited is a package offered on the USDM Legacy that had the same additions as the GT trim, and added the factory all weather package.
This included features like heated seats, de-icer, and mirror defrosters, but retained the same EJ251 engine.
The GT is a tuned version of the Legacy Wagon, using 2.0l twin-turbo engine.
USDM GT
The USDM GT is a trim model that featured larger brake calipers than the standard trim, as well as simulated wood interior trim. The engine is the same 2.5l naturally aspirated EJ251 engine found in the standard trim.
USDM GT Limited
The GT Limited is a package offered on the USDM Legacy that had the same additions as the GT trim, and added the factory all weather package. This included features like heated seats, de-icer, and mirror defrosters, but retained the same EJ251 engine.
Subaru Legacy (third generation)