This is a third-generation Infiniti G-Series sedan that was sold between 2007 and 2015. It was a compact sedan aimed at the likes of Lexus IS, BMW 3 Series and Mercedes-Benz C-Class.
To be more specific, this is an Infiniti G37, which is basically a posher Skyline sedan with the heart of a 370Z.
Engine wise, it was powered by a VQ37HR engine that can be found in other 37-prefixed Infiniti models and also the 370Z. This means it can pumped out 328bhp and 365Nm of torque at 5200rpm.
Although the torque is available at 400rpm layer than in a G35, the G37's torque curve had been improved and flattened. Hence, this means a smoother power delivery and better refinements as being praised by the reviewers.