The Cadillac XTS 3.6 V6 Twin Turbo 420hp (2013 - 2016) produces 420bhp and 583Nm in standard form. Our Stage 1 ECU tuning file raises output to 480bhp and 680Nm, a gain of 60bhp and 97Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.