Honda today unveiled the Acura Advanced Sedan Concept at the Los Angeles auto show. The '07 Acura RL is powered by a 290-horsepower 3.5-liter SOHC V6. Honda has yet to insert a V8 into its lineup, although the proportions of the Advanced Sedan Concept seem to lend themselves to a bigger powertrain. The concept is 79.5 inches wide, compared with the 72.7-inch width of the current RL. The concept is outfitted with 22-inch front and 23-inch rear tires mounted on custom billet-machined, polished aluminum wheels. Brake discs and calipers accent the wheels, and large ducts direct air to the components. The concept's roof is made of tinted glass. The striking exterior features include a five-sided grille made of polished aluminum, accented by a cut crystal Acura emblem. Narrow headlights double as air intakes and are positioned low on the bumper.