Audi’s S4 brings a totally new definition to elegant driving. Buying a used Audi S4 seems to be one of the top trends worldwide. It offers a stellar amount of torque and its TFSI engine mated to Audi’s Quattro all-wheel drive system makes the S4 series a powerful option. If you are looking to purchase the best pre owned cars Montreal has to offer, then the Audi S4 models should be in your list of cars to check out.