A DiabloSport Modified PCM allows you to unlock the performance potential of your 2021 5.7 or 6.4L. This Performance Kit includes a DiabloSport Modified PCM for your vehicle as well as an inTune i3 Part Number 8345 handheld programmer. Bring your Hemi Powered car to a new level! DiabloSport now offers a full line of tuning options compatible with the 2021 Dodge Charger and Challenger and Chrysler 300 5.7L and 6.4L Hemi. DiabloSport applies their expertise in Hemi tuning to these vehicles, which allows an even more enjoyable driving experience. More power, improved throttle response, better shifting behavior and overall increased performance are among the benefits of tuning with DiabloSport. Once again, DiabloSport brings you Power You Can Feel! Whether you are looking to eek out every last tenth at the dragstrip, or simply enjoy your car as a daily driver, there are improvements to be had through tuning. DiabloSport does the hard part for you, by developing clean, powerful tunes for 91 and 93 octane fuels. Then we give you a host of user defined options, like the ability to disable the top speed limiter or recalibrate the speedometer for different tire sizes. Looking for every last drop of performance? Built in datalogging allows you to see data, like timing or knock retard, by viewing the logs on Diablosport Dataviewer PC software. NOTE: YOU MUST SAVE YOUR STOCK CALIBRATION WITH YOUR TUNING DEVICE BEFORE REMOVING THE STOCK PCM FROM THE VEHICLE. PLEASE REFER TO THE INSTRUCTIONS THAT COME WITH YOUR UNLOCKED PCM.