The Cadillac CTS 3.6 V6 426hp (2014 ->) produces 426bhp and 583Nm in standard form. Our Stage 1 ECU tuning file raises output to 465bhp and 636Nm, a gain of 39bhp and 53Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.