The Buick Rendezvous 3.6 V6 246hp (2005 ->) produces 246bhp and 314Nm in standard form. Our Stage 1 ECU tuning file raises output to 260bhp and 330Nm, a gain of 14bhp and 16Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.