There are no separate M45 models, so the powerful V8 with its smooth five-speed automatic transmission is what you get. But it's not all. For the base price of $42,300, more great features come standard: the same high-quality leather as in the flagship Q45, a 225-watt Bose premium sound system with satellite-ready AM/FM radio and in-dash 6 CD changer, Vehicle Information System with large LCD screen, skid control (VDC, for Vehicle Dynamic Control), dual-zone climate control, high-intensity xenon headlamps, 18-inch alloy wheels with W-rated tires, and last but definitely not least, front-door side airbags and four-door curtain airbags.
The Comfort and Convenience Package ($950) includes memory seats, electrochromic mirrors which are heated and reverse-tilting on the outside, the HomeLink remote system and a tire pressure monitor.
The Technology Package ($2700) includes the DVD navigation system and Intelligent Cruise Control, which uses lasers to maintain the distance from the car in front of you by controlling the throttle.
The Premium Package ($2200) includes seats that are cooled as well as heated, a sunroof, and voice recognition system for climate, audio and navigation control. Chrome wheels can be added to this package for another $1000.
Stand-alone options include the sunroof ($1000), natural maple trim ($300), rear spoiler ($540), satellite radio ($400) and all-season tires (no extra cost).