The Audi A4 2.5 V6 TDI 163hp (B7 - 2004 - 2008) produces 163bhp and 350Nm in standard form. Our Stage 1 ECU tuning file raises output to 190bhp and 420Nm, a gain of 27bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.