Chrysler?s 300 sedan looks more like a luxury car than a standard-sized American sedan,and for 2007 it gets even more limo-like with a new stretched-wheelbase version that provides more than 46 inches of rear leg room (compared to 40.2 in the already comfortable standard version). Also new for the 2007 model year is the availability of such additional luxury-car features as adaptive cruise control that maintains a safe distance between your vehicle and the one ahead,SmartBeam headlamps,heated rear seats,an auto-dimming passenger-side rearview mirror,as well as turn signals and ?puddle? lamps built into the exterior mirrors.