The Porsche 911 GT3 RS 3.8i 435hp (2004 - 2011 ( 997 )) produces 435bhp and 430Nm in standard form. Our Stage 1 ECU tuning file raises output to 455bhp and 450Nm, 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.