The Seat Leon 1.8T 20v 225hp (1M - 2000 - 2006) produces 225bhp and 280Nm in standard form. Our Stage 1 ECU tuning file raises output to 260bhp and 400Nm, a gain of 35bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.