The Audi A4 1.9 TDI 90hp (B5 - 1995 - 2001) produces 90bhp and 202Nm in standard form. Our Stage 1 ECU tuning file raises output to 120bhp and 270Nm, a gain of 30bhp and 68Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.