The Audi A4 1.4 TFSI 125hp (B8 - 2012 - 2015) produces 125bhp and 200Nm in standard form. Our Stage 1 ECU tuning file raises output to 145bhp and 250Nm, a gain of 20bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.