Timing chains instead of belts is one of the changes as well as direct injection.
Edit: From the Wikipedia page on
Subaru Engines.
I can't verify if this information is correct though.
Quote:
A version with direct fuel injection and twin-scroll turbocharger was been introduced in 2012 to the Japanese market for the Legacy GT DIT.
Bore: 86 mm
Stroke: 86 mm
Displacement: 1,998 cc
Compression Ratio: 10.6:1
Power: 300 PS (221 kW; 296 hp) at 5,600 RPM
Torque: 40.8 kg·m (400 N·m; 295 lb·ft) at 2,000-4,800 RPM
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