5.3 V8 355hp Stage 1 tuning

The GMC Sierra 5.3 V8 355hp produces 355 hp and 519 Nm as standard. The YASTUNING Stage 1 remap file takes it to 375 hp and 540 Nm, a gain of +20 hp and +21 Nm. Engine code L83. ECU: Delco E92. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.