Without popping the hood, you'd be hard-pressed to find the visual differences between the new Infiniti G25 Sedan and the existing G37 Sedan. They both sport the same design inside and out—including the clean, nicely tailored sheetmetal, cockpit-like interior, and snug sport seats. Except powering the G25 is a new 2.5-liter V-6. While the...

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