GMC Sierra 4.3 V6 200hp ECU Tuning File

The GMC Sierra 4.3 V6 200hp (1999 - 2007) produces 200bhp and 350Nm in standard form. Our Stage 1 ECU tuning file raises output to 220bhp and 370Nm, a gain of 20bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.