The Porsche 911 3.6i GT3 RS 400hp (1997 - 2006 ( 996 )) produces 400bhp and 385Nm in standard form. Our Stage 1 ECU tuning file raises output to 420bhp and 420Nm, a gain of 20bhp and 35Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.