The Cadillac ATS 3.6 V6 321hp (2013 ->) produces 321bhp and 358Nm in standard form. Our Stage 1 ECU tuning file raises output to 350bhp and 380Nm, a gain of 29bhp and 22Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.