German tuning company Maxi-Tuner has upgraded the power output of the Porsche 911 Turbo and the 911 Turbo S (991 generation). Fitted as standard, the Porsche 911 Turbo and the 911 Turbo S are equipped with a 3.8-liter twin-turbo six cylinder engine. With this, the 911 Turbo delivers 527 PS with 660 Nm of torque […]