Because the smaller engine produces 603bhp and 626lb ft of torque. Compare that to the 577bhp and 590lb ft of the old car. So, more power, but to all four wheels? It’s actually a fully variable four-wheel drive system which can put virtually all the power to the rear wheels if desired. Since many will desire just this, Mercedes-AMG is going to give it a mode all to itself. Hmm, what to call it? Ah, Drift Mode.