The Chevrolet Express 6.0 V8 304hp (2008 - 2014) produces 304bhp and 488Nm in standard form. Our Stage 1 ECU tuning file raises output to 325bhp and 520Nm, a gain of 21bhp and 32Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.