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The 2007 Infiniti M offers a V6 or V8 engine in five different models. All are equipped with a five-speed automatic transmission.

The Infiniti M35 ($41,450) is powered by a 275-horsepower V6 engine. The M35X ($44,550) is an all-wheel-drive version of the M35.

Leather seats with heating and ventilation come standard on the M35, and the driver's seats offers 10-way power adjustments. Also standard: Brazilian Rosewood trim, a 160-watt six-speaker AM/FM/cassette stereo with 6CD changer, power sunroof, Bluetooth cell phone interface, voice activation of many controls and a seven-inch LCD screen that displays most vehicle information. Standard wheels are 18 inches in diameter.

The M35 Sport ($44,250) is, as the name suggests, a sportier version of the rear-drive M35. The Sport adds a sport-tuned suspension with Rear Active Steer (RAS), 19-inch alloy wheels, aluminum interior trim, and auto-leveling high-intensity xenon headlights with Adaptive Front Lighting System (AFS), which swivels the lights to shine around in turns.

The M45 ($49,100) and M45 Sport ($50,550) are identical to their M35 counterparts, except that each is powered by 325-hp V8.

An available Premium Package ($8,900) includes almost every available option: navigation system, RearView camera, Lane Departure Warning, intelligent cruise control, DVD-based Mobile Entertainment System for rear passengers, heated and power-reclining rear seats, power rear sunshade and rear passenger climate and audio controls.

Standalone options include XM or Sirius satellite radio ($350); the DVD entertainment system ($1,500), 18-inch chrome wheels ($1,000), an aerodynamic body kit ($1,590) and a rear spoiler ($290).

Safety features include dual-stage front airbags, front-passenger side-impact airbags, and curtain-style head-protection airbags for all outboard seats. All Infiniti M models feature Vehicle Dynamic Control skid-management electronics, traction control, and an advanced ABS system. Optional safety equipment includes the lane departure warning system, RearView camera, preview braking and pre-crash seat belts. In front-offset and side-impact crash tests conducted by the Insurance Institute for Highway Safety, the M35/45 got Good ratings, on a scale that includes Good, Acceptable, Marginal, and Poor.