While using the same basic 3.8-liter flat-six as a Porsche 911 Carrera S, modifications to the intake and exhaust systems help bump GTS-spec output from 385 horsepower to 405 ponies -- just 27 less than a 911 GT3. The secret of this extra muscle lies in a special resonance intake manifold that has six vacuum-controlled tuning flaps compared to just one in the Carrera S, a feature that permit real-time switching between power and torque-optimized geometry. While maintaining the same 310 lb-ft of max torque, these cylinder-specific micromanagers give this more potent six more efficient mid-range punch, yet have no impact on its fuel economy numbers.