But this isn't the I4 of old, this is a modern, direct injected turbo with variable cam timing. The GM 2.0L Ecotech makes 270HP and 260lb-ft of torque. It is a similar engine to the Ford 2.0L Ecoboost which is now the fuel economy option for the Explorer.
By comparison, the FWD versions of the famed Northstar engine family (LD8) made 275HP and 300ft-lbs, out of a whopping 4.6L of displacement.
More at GM's web site.