So, what’s under the hood? Infiniti didn’t divulge specifics, but you can certainly expect a return of the 3.5-liter VQ-Series V6 engine making at least 300 horsepower, and possibly even the 335-horse 4.5-liter V8 from the M45 in the top model. And, since the Infiniti Coupe Concept is riding on an evolution of the vaunted FM-platform, expect a balanced blend of performance-tuned handling and luxurious ride quality, thanks in part to 20-inch Bridgestone Potenza performance tires and giant four-wheel-disc brakes.