4.2i - 270hp Stage 1 tuning

The GMC Envoy 4.2i - 270hp produces 270 hp and 373 Nm as standard. The YASTUNING Stage 1 remap file takes it to 290 hp and 395 Nm, a gain of +20 hp and +22 Nm. Engine code LL8. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.