Back in 2005-2006, when the "HEMI" V8-powered Chrysler 300 and Dodge Charger were new, these large sedans were the hottest thing out of Detroit. But once gas prices shot up to $4 a gallon they fell off buyers' consideration lists. For 2012 Chrysler offers both with a 292-horsepower V6 and eight-speed automatic. Exactly what these large rear-wheel-drive sedans needed to make them relevant again, or a lame attempt to make them something they're not?