The Chevrolet SSR 6.0 V8 396hp (2003 - 2006) produces 396bhp and 549Nm in standard form. Our Stage 1 ECU tuning file raises output to 415bhp and 580Nm, a gain of 19bhp and 31Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.