With the debut of the M45 Concept in New York last year, Infiniti showed that it had learned its lesson - provide a car that looks as good as it drives. And with the launch of the production version of the M35/M45 at the 2005 North American International Auto Show, Infiniti officials let it be known that the theme of this M is inspire, illuminate, and engage. That attitude, coupled with the new M's bigger-G35 looks will surely open some eyes.

Five models will be offered for 2006: M35; M35 Sport; M35 All-Wheel-Drive; M45; and the M45 Sport. Prices range from $39,900 for the M35 and $49,550 for the M45 Sport (excludes destination).

Based on a more rigid next-generation front-midship (FM) platform that positions engine weight behind the front axle for improved handling balance, the new 2006 Infiniti M will be available in two flavors: the M35 with a 280-horsepower, 3.5-liter V6 and the M45 with a 335-horsepower, 4.5-liter V8; both fired with push-start control through a standard Infiniti Intelligent Key system and both requiring premium unleaded fuel.

Power flows through a five-speed automatic transmission with a short-throw manual shift feature to 18-inch rear wheels, and the M35x model features all-wheel-drive. Buy the M35 Sport or the M45 Sport and you'll get a Rear Active Steer system that adjusts the geometry of the rear suspension according to steering input and vehicle speed, as well as 19-inch lightweight wheels wearing 245/40 performance tires. Run-flat tires and chrome-finish wheels are optional on non-Sport models, and just in case the driver exceeds the limits of talent a standard Vehicle Dynamic Control (VDC) stability control system is on alert to make course corrections.

Chock full of the features that most people expect in a luxury car of this caliber, standard equipment includes Bluetooth wireless communications. Options such as a rear DVD-based entertainment system and a RearView Monitor with wheel trajectory pathing are available. However, on the technology front, the 2006 Infiniti M is particularly notable for its optional Lane Departure Warning (LDW) system. This technology reads lane markings and warns the driver if unintended lane drift is detected.

To keep occupants even safer, the Infiniti M includes a tire pressure monitor as well as an Advanced Airbag System (AABS) of dual-stage front airbags with occupant classification and side-curtain airbags. Pre-crash front seatbelts that can sense an impending collision and prepare the restraints for impact are optional.

Additional techie bits and pieces include standard voice recognition technology for a number of interior features, an optional intelligent cruise control designed to maintain a safe distance behind the car ahead, and HID headlights that swivel with the steering to help illuminate around curves (standard on Sport models; optional on others). Genuine Rosewood or aluminum trim, combined with leather upholstery, outfit the Infiniti M's cabin, which also includes an electrofluorescent "solar eclipse" gauge cluster and a sound system with in-dash CD changer and MP3 playback capability. An impressive Bose Studio Surround audio system with 14 speakers, including two mounted inside the front seats, is optional.

The 2006 Infiniti M is also a roomy car, offering generous space for four adults (five can ride in back if necessary). Climate-controlled front seats are optional, and buyers can equip the M with heated and reclining rear seats if they wish.

In terms of year-over-year sales gains, Infiniti has been leading the luxury segment for two consecutive years on the strength of the G35 Coupe, the G35 Sedan, and the FX SUV. Initial impressions suggest that the 2006 Infiniti M35 and M45 will continue the company's winning streak.

Due to arrive on dealers lots in early February for viewing and test drives, customer deliveries will be begin at the end of the month.

By Christian J. Wardlaw and Thom Blackett