The Porsche 911 Carrera S 3.8i 355hp (2004 - 2011 ( 997 )) produces 355bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 375bhp and 420Nm, 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.