The Vauxhall Vivaro 2.5 CDTi 135hp (2001 - 2014) produces 135bhp and 310Nm in standard form. Our Stage 1 ECU tuning file raises output to 163bhp and 370Nm, a gain of 28bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.