Have the power ratings changed for the new M45 versus the 2004 model?
Yes. The horsepower dropped from 340 in the 2004 model to 335 in the 2006 Infiniti M; torque has increased from 335 lb.-ft. at 4,000 rpm to 340 lb.-ft. at 4,000 rpm. Infiniti product planners explained that the engineers' goal was to "put much more power and torque in the driving range." However, we're still trying to figure out how a loss of five horsepower and a gain of a measly five lb.-ft. of torque amount to "much more power and torque."

Out of the five 2006 Infiniti M models, which is the best value?
Most people will be more than satisfied with either the M35 or M35 Sport - both offer a bounty of standard features, a comfortable ride, and plenty of power. Unless you live in an area with a lot of bad weather, the M35X's all-wheel drive isn't necessary, and the M35 Sport can be had for nearly the same money. And the M45? As fun as it is, most people won't ever need the extra power, making the premium price a hard sell.

Is Infiniti planning on adding any models to the M's lineup?
All-wheel-drive versions of the M35 Sport and the M45/M45 Sport are possibilities, but there are no production plans at this time.

Photos courtesy of Infiniti North America