The Buick Century 3.1 V6 160hp (1998 - 2005) produces 160bhp and 251Nm in standard form. Our Stage 1 ECU tuning file raises output to 180bhp and 280Nm, a gain of 20bhp and 29Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.