GMC Sierra 5.3 V8 355hp ECU Tuning File

The GMC Sierra 5.3 V8 355hp (2017 ->) produces 355bhp and 519Nm in standard form. Our Stage 1 ECU tuning file raises output to 375bhp and 540Nm, a gain of 20bhp and 21Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.