To answer the OP's question, all 2013-14 GTs, regardless of base or Premium models, have the same engine rated at 420hp.
1989 Blue LX Hatchback
2001 Red SVT Cobra Convertible (Phoenix)
2002 Black/Red GT (Ginger)
2011 Red Candy Metallic V6 (Manfred)
2016 Magnetic Metallic GT (Susie II)