2014 Buick Regal GS AWD: Conquering Winter's Worst Published on February 24, 2014 in Special Events by Benjamin Hunting Photo: Benjamin Hunting. Out on the ice, the Buick Regal GS AWD's turbocharged, 2.0-liter four-cylinder engine finally had a chance to unleash the full fury of its 259 horsepower and 295 lb-ft of torque.