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Now playing in a dealer showroom near you. No purchase necessary, but satisfaction guaranteed. * Infiniti M45 Price: $45,995 Engine: 4.5-liter V8, 340 hp, 333 lb-ft Curb weight: 3851 lbs Drivetrain: rwd, five-speed automatic Don't quite see yourself behind the wheel of Infiniti's Q45, with its grandpamobile implications? Not to worry: Infiniti has rolled out a smaller but no-less-powerful version in the M45 sedan. Just like its bigger sedan sibling, the M45 won't necessarily wow with its conservative lines and squared-off proportions. Yet packaged in its smaller size ...