5.3 V8 303hp Stage 1 tuning

The Pontiac Grand Prix 5.3 V8 303hp produces 303 hp and 438 Nm as standard. The YASTUNING Stage 1 remap file takes it to 325 hp and 460 Nm, a gain of +22 hp and +22 Nm. Engine code LS4. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.