The Volkswagen Transporter / Multivan 2.5 TDI 150hp (T4 - 1999 - 2004) produces 150bhp and 295Nm in standard form. Our Stage 1 ECU tuning file raises output to 185bhp and 350Nm, a gain of 35bhp and 55Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.