The Porsche 911 Carrera GTS 3.8i 408hp (2004 - 2011 ( 997 )) produces 408bhp and 420Nm in standard form. Our Stage 1 ECU tuning file raises output to 425bhp and 445Nm, a gain of 17bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.