The Buick Park Avenue 3.8 V6 240hp (1999 - 2005) produces 240bhp and 380Nm in standard form. Our Stage 1 ECU tuning file raises output to 270bhp and 420Nm, a gain of 30bhp and 40Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.