5.3 V8 304hp Stage 1 tuning

The Buick Rainier 5.3 V8 304hp produces 304 hp and 447 Nm as standard. The YASTUNING Stage 1 remap file takes it to 321 hp and 471 Nm, a gain of +17 hp and +24 Nm. Engine code 5300 Small Block. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.