Model Variant Original BHP Tuning Performance Challenger MT745B 8.8 R6 272 BHP Stage 1: ECU Remap +68 BHP Challenger MT755B 8.8 R6 305 BHP Stage 1: ECU Remap +76 BHP Challenger MT465B 8.8 R6 324 BHP Stage 1: ECU Remap +82 BHP