4.3 V6 285hp Stage 1 tuning

The GMC Sierra 4.3 V6 285hp produces 285 hp and 413 Nm as standard. The YASTUNING Stage 1 remap file takes it to 305 hp and 440 Nm, a gain of +20 hp and +27 Nm. Engine code LU3. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.