4.2 V8 279hp Stage 1 tuning

The Buick Rainier 4.2 V8 279hp produces 279 hp and 373 Nm as standard. The YASTUNING Stage 1 remap file takes it to 295 hp and 395 Nm, a gain of +16 hp and +22 Nm. Engine code LL8. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.