Buick has released the final performance specifications for the 2012 Regal GS.

While it's no Insignia OPC, the car has a turbocharged 2.0-liter four-cylinder engine with 270 hp (201kW / 274 PS) and 295 lb-ft (400Nm) of torque - 15 hp (11 kW / 15 PS) more than original estimates. This enables the GS to accelerate from 0-60 mph in approximately 6.7 seconds, when equipped with a six-speed manual tranmission.

According to Mike Anderson, Ecotec global chief engineer and program manager, "The Regal GS 2.0L turbo delivers the highest specific output of any production engine GM has ever offered, and at 135 hp per liter is the most power dense engine ever certified by SAE."

The 2012 Buick Regal GS will start arriving at U.S. dealerships this fall, but there's no word on pricing yet.

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