From Infiniti press: The 2004 Infiniti M45 performance sport sedan (which will be available in February 2004) carves out a unique position among mid-size luxury sedans – call it the “muscle car with brains.” The middle player in Infiniti’s lineup of performance-oriented front-engine, rear-wheel drive sedans, the 2004 M45 shares many major powertrain components (including its 4.5-liter DOHC V8) with Infiniti’s flagship Q45 performance luxury sedan. Yet with its standard class-leading V8 performance and a long list of world-class amenities, the M45 is price-competitive with other competitors’ 6-cylinder models.
For 2004, the M45 interior receives standard driver's seat two-position memory system, electrochromic auto-dimming rearview mirror, HomeLink® Universal Transceiver, and electronic compass (previously available as part of the Comfort and Convenience Package). Also new is a Navigation / Voice Recognition Package which features Infiniti’s DVD Navigation system and voice recognition system. Additionally, the CD changer moves from the glove box and becomes an in-dash 6-disc CD autochanger.
tandard on all models is an aluminum-alloy, double overhead-cam, 4.5-liter V8 engine that produces 340 horsepower and 333 lb-ft of torque. Controlling this powerplant is a standard 5-speed automatic transmission with improved manual shift mode operation for 2004.
Other performance features include Vehicle Dynamic Control (VDC), which helps improve vehicle stability during understeer, oversteer or adverse road conditions, an integral Traction Control System (TCS), Brake Assist (BA) with Electronic Brake force Distribution (EBD) and vehicle speed-sensitive power rack-and-pinion steering.
The M45's aggressive handling, outstanding stability and responsive steering are provided by an independent strut suspension with coil springs in the front and an independent multi-link suspension in the rear. Standard 18-inch wheels and 235/45WR18 high performance tires contribute to the crisp performance and responsive chassis capability. A Tire Pressure Monitor System with warning light is now standard on all models.