660B - 8.4 - 303hp Stage 1 tuning

The Challenger 6xx 660B - 8.4 - 303hp produces 303 hp and 1 Nm as standard. The YASTUNING Stage 1 remap file takes it to 381 hp and 1 Nm, a gain of +78 hp. The file is checksum-corrected and reviewed by an experienced calibrator within factory component tolerances.