2011 Infiniti M56
 

http://images.thecarconnection.com/t...00316363_t.gif Compared to the 330-horsepower M37, the M56 sounds like overkill with its 420-hp, 5.6-liter V-8. But this engine is startlingly fast and, thanks to engineering improvements, no longer comes with such a fuel economy penalty. We also tend to like the M56 better than the M37, as the V-8 powertrain feels smooth and strong; the M37's V-6 is one of the...

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