The new-generation Legacy 2.5GT models get a significant boost in performance from the revised 2.5-liter turbocharged / intercooled engine (based on the Impreza WRX engine) teamed to a new standard 6-speed manual transmission. Notably, the new 6-speed is more than 50 pounds lighter than the 6-speed unit used in the 2009 Subaru Legacy 2.5GT spec.B.

A larger turbocharger increases boost, and a new exhaust uses a low-density catalyst for reduced backpressure. To improve weight distribution and help lower the center of gravity, the turbocharger is now mounted below the engine. With 265 horsepower and 258 lb.-ft. of peak torque (compared to 243 hp and 241 lb.-ft. in the previous 2.5GT models), the 2010 Subaru Legacy 2.5GT models can accelerate from zero to 60 mph in under six seconds.