The Cadillac XTS 3.6 V6 304hp (2013 - 2016) produces 304bhp and 358Nm in standard form. Our Stage 1 ECU tuning file raises output to 324bhp and 380Nm, a gain of 20bhp and 22Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.