The Porsche 911 GT3 RS 4.0i 500hp (2004 - 2011 ( 997 )) produces 500bhp and 460Nm in standard form. Our Stage 1 ECU tuning file raises output to 520bhp and 480Nm, 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.