The Porsche 911 3.8i GTS 430hp (2011 - 2015 ( 991 )) produces 430bhp and 440Nm in standard form. Our Stage 1 ECU tuning file raises output to 450bhp and 460Nm, a gain of 20bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.