5.3 V8 300hp Stage 1 tuning

The Hummer H3 5.3 V8 300hp produces 300 hp and 430 Nm as standard. The YASTUNING Stage 1 remap file takes it to 320 hp and 450 Nm, a gain of +20 hp and +20 Nm. Engine code LH8. ECU: Delco E38, Delco E67. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.