The DiabloSport inTune i3 + Unlocked PCM Kit is the complete performance tuning package for 2021 Dodge Challenger models equipped with the 5.7L or 6.4L HEMI. With locked factory PCMs limiting tuning, this kit provides everything you need to safely unlock your Challenger’s full performance potential. Preloaded with dyno-tested performance tunes, the inTune i3 handheld programmer (PN 8345) delivers up to 25 rear-wheel horsepower gains, improved torque, sharper throttle response, and refined 8-speed transmission calibrations for quicker, smoother, and more confident shifting. The result is a Challenger that feels more powerful, more responsive, and more fun to drive. For enthusiasts who want more flexibility, the Platinum i3 supports CMR custom tuning, enabling dyno-proven calibrations tailored for bolt-ons or advanced modifications. Built-in data logging and diagnostic tools make it easy to monitor and refine performance as your build evolves. This kit includes the inTune i3 handheld programmer and a DiabloSport Modified PCM shipped via a one-time cross-shipment, allowing you to start tuning right away while keeping your stock PCM safe and unaltered. For 2021 Challenger HEMI owners who want power you can feel, sharper drivability, and tuning flexibility, the inTune i3 + Unlocked PCM Kit is the ultimate upgrade.