Several publications have referred to the follow cars driven by the U.S. Postal Service Cycling Team as Subaru GT's. I did a little bit of research and found out that the specific model is the Subaru Legacy GT or Subaru Legacy GT Limited station wagon. These are not the most popular vehicles Subaru sells in the United States, but they are available.
Both the Legacy GT and the Legacy GT Limited have 2.5-liter turbocharged engines, producing 250 horsepower. They are both priced at less than $30,000 MSRP, without all of the customizations done for the Tour.
Edmunds.com reviewed the 2005 Legacy models, saying the following:
Known primarily as the wagon that spawned the Outback, the Legacy is the oldest nameplate in the Subaru lineup, dating back to 1990. In recent years, it has been living in the shadow of its armored-wagon offspring. Starved for power and features, the 2000-2004 Legacy wagon was what you bought if you couldn't afford one of Volkswagen's expensive Passat 4Motion wagons, and/or you wouldn't be caught dead in a Taurus.... Happily, Subaru has given buyers more reasons to consider its midsize sedan and wagon for 2005: The.... GT models feature a modified version of the WRX STi's 2.5-liter turbocharged engine rated for 250 horsepower and 250 lb-ft of torque. Although the continued absence of six-cylinder power in the Legacy might seem like a blow, rest assured that you won't miss it. The turbo four responds with the heart and refinement of a much larger steed.
These wagons are an interesting alternative to a larger SUV or the Subaru Outback and Forester models that seem to be everywhere around my home. I didn't even realize that these Legacy wagons were on the market in the USA.