Acura will show the replacement for its RL flagship sedan at April's New York auto show. While many automakers now feel that a V-8 engine is necessary in a luxury sedan, Acura plans to keep the RL V-6-powered. Engine displacement will reportedly increase to 3.7 liters from 3.5. Honda officials say the six will provide adequate power for the RL, and point out that Acura's sportiest model, the NSX, makes 290 horsepower with a smaller V-6. The new RL will go on sale this fall, and will switch from front- to all-wheel drive.