To achieve an increase of 153 horsepower Mercedes is equipping the motor with forged pistons and special bearings. Displacement is increased to 2.0 liters from 1.8. It also gets a bigger turbocharger which supplies 26 pound of boost in stock form. Redline is expected to be around 6300 rpm. The head of AMG development Tobias Moers claims the motor is as strong internally as any other AMG motor which it will need to be considering the very high specific output which eclipses any other German competitor's turbo four cylinder motors including Audi, VW, and BMW.
With 173 horsepower per liter the engine eclipses even the output of the 997 GT2 RS, impressive. The competition will have their hands full in this segment although Audi will likely use its 2.5 liter 5-cylinder to compete. BMW is apparently even planning an M version of their N20 turbo 2.0 liter four-cylinder to compete with this engine.