SS 5.3 307hp Stage 1 tuning

The Chevrolet Impala SS 5.3 307hp produces 307 hp and 438 Nm as standard. The YASTUNING Stage 1 remap file takes it to 332 hp and 467 Nm, a gain of +25 hp and +29 Nm. Engine code LS4. ECU: Delco E67. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.