DiabloSport 8266-R Chevrolet GMC 6.6 Tuner/Programmer

The DiabloSport inTune i3 8266-R Kit is the breakthrough tuning solution for 2020–2023 GM trucks equipped with the 6.6L L8T gas engine. These trucks shipped with locked PCMs that blocked tuning—until now. This complete kit includes the powerful inTune i3 handheld tuner, along with DiabloSport’s exclusive locksmith device and harnesses required to unlock your ECM.\nOnce unlocked, the inTune i3 unleashes dyno-tested tunes for 87, 91, and 93 octane fuels, delivering gains of up to 28 rear-wheel horsepower and 50 rear-wheel torque over stock. Alongside raw power, the tunes refine drivability with better throttle response, improved part-throttle performance, and smoother shifting, transforming how your truck feels on the road or under load.\nBeyond the preloaded calibrations, the i3 also provides a wide range of user-adjustable parameters, including tire size adjustments, speed limiter removal, throttle sensitivity, and more. Added features for these newer GM platforms include last mode recall, so your truck always remembers your preferred driving settings.\nFor GM truck owners ready for a true performance upgrade, the inTune i3 8266-R Kit delivers proven horsepower and torque gains with the drivability improvements your 6.6L L8T deserves.