The Porsche 911 3.8i Turbo 520hp (2011 - 2015 ( 991 )) produces 520bhp and 710Nm in standard form. Our Stage 1 ECU tuning file raises output to 600bhp and 800Nm, a gain of 80bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.