Description
Overview
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 Chevrolet and GMC 6.6 computer chip programmer kit includes the powerful inTune i3 handheld tuner, along with DiabloSport’s exclusive locksmith device and the harnesses required to unlock your ECM, giving you full control over a platform that was previously off-limits.
Built for gasoline-powered L8T trucks, the inTune i3 combines proven performance tuning with modern hardware. A vivid color touch screen display makes navigating menus, loading tunes, and monitoring your engine simple and intuitive, while Wi-Fi updates keep the device current without extra hardware. Whether you’re chasing more power or dialing in a smarter daily driver, this DiabloSport programmer delivers a straightforward path to unlocking your truck’s potential.
Key Benefits
Because factory PCMs on the 2020–2023 6.6L L8T were locked from the factory, off-the-shelf tuning simply wasn’t possible. The 8266-R Kit solves that with DiabloSport’s locksmith device and included harnesses, allowing you to unlock the ECM and load performance tunes engineered for the L8T gas engine. From there, the inTune i3 opens the door to real, measurable adjustments and ongoing tuning flexibility.
Beyond canned performance tunes, the i3 supports custom tuning and accepts custom tunes from CMR, so you can work with a tuner to fine-tune your exact setup. Enthusiasts and data-driven builders will appreciate onboard data logging with 5-volt data logging inputs, plus speedometer correction to keep readings accurate after modifications like tire and gear changes.
Highlights
- Complete kit: inTune i3 handheld tuner, DiabloSport locksmith device, and unlock harnesses
- Purpose-built for 2020–2023 GM trucks with the 6.6L L8T gasoline engine
- Unlocks the factory-locked PCM/ECM that previously blocked tuning
- Color touch screen display for easy, intuitive operation
- Wi-Fi updates, plus data logging with 5-volt data logging inputs
- Performance tunes, custom tuning, and support for custom tunes from CMR
- Speedometer correction for accurate readings after modifications
Fitment
This kit is engineered specifically for 2020–2023 GM trucks equipped with the 6.6L L8T gas engine. Fuel type is gasoline. Please note this product is not 50-state legal and is not CARB (California) compliant, and it carries a California Proposition 65 warning. It does not include an AC adapter, is not video capable, and does not offer in-cab monitoring. Confirm your truck matches the L8T application before ordering to ensure the locksmith device and harnesses are correct for your ECM.
