The Porsche 911 Carrera 3.4i 350hp (2011 - 2015 ( 991 )) produces 350bhp and 390Nm in standard form. Our Stage 1 ECU tuning file raises output to 370bhp and 410Nm, 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.