Growing up doesn't have to suck the fun out of driving. You don't have to sell your soul -- and your Mitsubishi Lancer Evo -- and buy a life-sucking, automatic-transmission, front-wheel-drive sled just because you landed a real job and produced offspring. These two luxury sedans appear grown up to the outside world, but when no one is looking, the cars can bring out your inner juvenile delinquent. You probably never thought of the Acura TL SH-AWD and the Audi S4 on the same day, much less in the same sentence. But this duo is remarkably similar in base price, power, and weight. And significantly, they both use torque-vectoring all-wheel-drive systems to ensure that they don't sacrifice one iota of the corner-carving thrills you've grown to love. Ladies and gentlemen, put your hands together for the two cars that will change your perception of all-wheel-drive luxury sedans.