The Porsche 911 Carrera 3.8i 376hp (2004 - 2011 ( 997 )) produces 376bhp and 415Nm in standard form. Our Stage 1 ECU tuning file raises output to 390bhp and 435Nm, a gain of 14bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.