Overview Dispatching another strong salvo in the strength wars, the 2021 Porsche 911 Turbo and Turbo S are ready to raise the stakes with up to 640 torque. High-yield sports vehicles, for example, the 577-hp Mercedes-AMG GT R, the 602-hp Audi R8, and the 631-hp Lamborghini Huracán Evo are altogether opponents to both 911 Turbos,…