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DiabloSport inTune 3 Unlock and Tune Kit 8266-R fits 2020-2023 Chevrolet / GMC

⚠️ Please verify fitment before purchasing. Check the fitment chart below or use the Year/Make/Model tool to confirm this part fits your vehicle.

⚠️ Verify fitment before purchasing. Check the fitment chart below or click the 3 lines in the top left menu, select Home, then use the Year/Make/Model guide.

DiabloSport
8266-R
Out of stock
$933.99 USD
DiabloSport inTune 3 Unlock and Tune Kit 8266-R fits 2020-2023 Chevrolet / GMC
Description
The 2020-2023 6.6 L8T GM gas trucks have been locked down since their introduction. Owners of these trucks have been waiting patiently for a tuning solution, and DiabloSport has delivered in a big way! The new 8266-R kit includes our inTune 3 handheld tuner, along with our industry exclusive locksmith device and harnesses required to unlock the ECM in your truck. Once unlocked, the inTune 3 offers up tunes for 87, 91 and 93 octane fuels, as well as 2 transmission tunes to choose from. Beyond the preloaded tunes, we offer a host of user adjustable parameters, like throttle response, speed limit, tire size, and more. We've even added some new features for drivers of these newer trucks, like the ability to recall your last mode setting!Get power you can feel, with DiabloSport!


This Part Fits:

Year Make Model Submodel Notes
2020 Chevrolet Silverado 2500 HD Custom
2021 Chevrolet Silverado 2500 HD Custom
2022 Chevrolet Silverado 2500 HD Custom
2023 Chevrolet Silverado 2500 HD Custom
2020 Chevrolet Silverado 2500 HD High Country
2021 Chevrolet Silverado 2500 HD High Country
2022 Chevrolet Silverado 2500 HD High Country
2023 Chevrolet Silverado 2500 HD High Country
2020 Chevrolet Silverado 2500 HD LT
2021 Chevrolet Silverado 2500 HD LT
2022 Chevrolet Silverado 2500 HD LT
2023 Chevrolet Silverado 2500 HD LT
2020 Chevrolet Silverado 2500 HD LTZ
2021 Chevrolet Silverado 2500 HD LTZ
2022 Chevrolet Silverado 2500 HD LTZ
2023 Chevrolet Silverado 2500 HD LTZ
2020 Chevrolet Silverado 2500 HD WT
2021 Chevrolet Silverado 2500 HD WT
2022 Chevrolet Silverado 2500 HD WT
2023 Chevrolet Silverado 2500 HD WT
2020 Chevrolet Silverado 3500 HD Base
2021 Chevrolet Silverado 3500 HD Base
2022 Chevrolet Silverado 3500 HD Base
2023 Chevrolet Silverado 3500 HD Base
2020 Chevrolet Silverado 3500 HD High Country
2021 Chevrolet Silverado 3500 HD High Country
2022 Chevrolet Silverado 3500 HD High Country
2023 Chevrolet Silverado 3500 HD High Country
2020 Chevrolet Silverado 3500 HD LT
2021 Chevrolet Silverado 3500 HD LT
2022 Chevrolet Silverado 3500 HD LT
2023 Chevrolet Silverado 3500 HD LT
2020 Chevrolet Silverado 3500 HD LTZ
2021 Chevrolet Silverado 3500 HD LTZ
2022 Chevrolet Silverado 3500 HD LTZ
2023 Chevrolet Silverado 3500 HD LTZ
2020 Chevrolet Silverado 3500 HD WT
2021 Chevrolet Silverado 3500 HD WT
2022 Chevrolet Silverado 3500 HD WT
2023 Chevrolet Silverado 3500 HD WT
2020 GMC Sierra 2500 HD AT4
2021 GMC Sierra 2500 HD AT4
2022 GMC Sierra 2500 HD AT4
2023 GMC Sierra 2500 HD AT4
2020 GMC Sierra 2500 HD Base
2021 GMC Sierra 2500 HD Base
2020 GMC Sierra 2500 HD Denali
2021 GMC Sierra 2500 HD Denali
2022 GMC Sierra 2500 HD Denali
2023 GMC Sierra 2500 HD Denali
2022 GMC Sierra 2500 HD Pro
2023 GMC Sierra 2500 HD Pro
2020 GMC Sierra 2500 HD SLE
2021 GMC Sierra 2500 HD SLE
2022 GMC Sierra 2500 HD SLE
2023 GMC Sierra 2500 HD SLE
2020 GMC Sierra 2500 HD SLT
2021 GMC Sierra 2500 HD SLT
2022 GMC Sierra 2500 HD SLT
2023 GMC Sierra 2500 HD SLT
2020 GMC Sierra 3500 HD AT4
2021 GMC Sierra 3500 HD AT4
2022 GMC Sierra 3500 HD AT4
2023 GMC Sierra 3500 HD AT4
2020 GMC Sierra 3500 HD Base
2021 GMC Sierra 3500 HD Base
2020 GMC Sierra 3500 HD Denali
2021 GMC Sierra 3500 HD Denali
2022 GMC Sierra 3500 HD Denali
2023 GMC Sierra 3500 HD Denali
2022 GMC Sierra 3500 HD Pro
2023 GMC Sierra 3500 HD Pro
2020 GMC Sierra 3500 HD SLE
2021 GMC Sierra 3500 HD SLE
2022 GMC Sierra 3500 HD SLE
2023 GMC Sierra 3500 HD SLE
2020 GMC Sierra 3500 HD SLT
2021 GMC Sierra 3500 HD SLT
2022 GMC Sierra 3500 HD SLT
2023 GMC Sierra 3500 HD SLT


Specifications:

5 Volt Data Logging Inputs Yes
50 State Legal No
AC Adapter No
Accepts Custom Tunes From CMR Yes
621 ABS
Brand DiabloSport
California Proposition 65 Required Yes
CARB (California) Compliant No
2278 No
Category Tuners and Programmers
Color Touch Screen Display Yes
Custom Tuning Yes
Data Logging Yes
Emission Code 7
2541 Yes
Fuel Type Gasoline
3390 Performance
3390 Regular
2543 Yes
part type Computer Chip Programmer
Performance Tunes Yes
2547 Yes
Product Type Handheld Tuner
2487 Yes
Speedometer Yes
Sub Category Engine Service
2544 Transmission
2544 Engine
5561 Yes
Warning California Proposition 65
Wi-Fi Updates Yes
5 Volt Data Logging Inputs Yes
50 State Legal No
AC Adapter No
Accepts Custom Tunes From CMR Yes
621 ABS
Brand DiabloSport
California Proposition 65 Required Yes
CARB (California) Compliant No
2278 No
Category Tuners and Programmers
Color Touch Screen Display Yes
Custom Tuning Yes
Data Logging Yes
Emission Code 7
2541 Yes
Fuel Type Gasoline
3390 Performance
3390 Regular
2543 Yes
part type Computer Chip Programmer
Performance Tunes Yes
2547 Yes
Product Type Handheld Tuner
2487 Yes
Speedometer Yes
Sub Category Engine Service
2544 Transmission
2544 Engine
5561 Yes
Warning California Proposition 65
Wi-Fi Updates Yes
Description_SHO 20-23 L8T i3 unlock
Description_INV 2020-2023 GM 2500/3500 6.6 Gas inTune 3
Description_DES DiabloSport inTune 3 Unlock and Tune Kit
Description_EXT Fits 2020-2023 6.6 L8T GM Silverado/Sierra
Description_MKT The 2020-2023 6.6 L8T GM gas trucks have been locked down since their introduction. Owners of these trucks have been waiting patiently for a tuning solution, and DiabloSport has delivered in a big way! The new 8266-R kit includes our inTune 3 handheld tuner, along with our industry exclusive locksmith device and harnesses required to unlock the ECM in your truck. Once unlocked, the inTune 3 offers up tunes for 87, 91 and 93 octane fuels, as well as 2 transmission tunes to choose from. Beyond the preloaded tunes, we offer a host of user adjustable parameters, like throttle response, speed limit, tire size, and more. We've even added some new features for drivers of these newer trucks, like the ability to recall your last mode setting!Get power you can feel, with DiabloSport!
Description_FAB 2020-2023 Silverado 2500/3500 6.6 L8T
Description_FAB 2020-2023 Sierra 2500/3500 6.6 L8T
Description_FAB 28 rwhp over stock on premium fuel
Description_FAB 50 rwtq over stock on premium fuel
Description_FAB Tunes for 87 octane, and premium fuel provided
Description_FAB ECM unlock included!
Description_FAB Unlock and Tune, at home!
Description_FAB Preloaded tunes for multiple octane levels
Description_FAB Support for 6.6L L8T applications with 6 speed Transmission
Description_FAB Throttle Boost setting for adjustable throttle feel
Description_FAB Adjust speedometer for larger tires (26"-38")
Description_FAB Calibrate speedometer for gear change (3.42-5.13)
Description_FAB Remove speed limiter for increased top speed
Description_FAB Adjust engine rev limiter for increased RPM range (+/- 400 RPM)
Description_FAB Adjust engine idle speed in Park/Neutral and Drive
Description_FAB ‘Keep Drive Mode Setting’ allows you to select a drive mode and it will remember that mode next time you start the truck!
Description_FAB Adjust fueling at WOT in multiple RPM ranges
Description_FAB Calibrate spark timing at WOT across multiple RPM ranges
Description_FAB Front/Rear TPMS threshold adjustment
Description_FAB Air Filter Monitor system control
Description_FAB Transmissions adaptive relearn
Description_SHO 20-23 L8T i3 unlock
Description_INV 2020-2023 GM 2500/3500 6.6 Gas inTune 3
Description_DES DiabloSport inTune 3 Unlock and Tune Kit
Description_EXT Fits 2020-2023 6.6 L8T GM Silverado/Sierra
Description_MKT The 2020-2023 6.6 L8T GM gas trucks have been locked down since their introduction. Owners of these trucks have been waiting patiently for a tuning solution, and DiabloSport has delivered in a big way! The new 8266-R kit includes our inTune 3 handheld tuner, along with our industry exclusive locksmith device and harnesses required to unlock the ECM in your truck. Once unlocked, the inTune 3 offers up tunes for 87, 91 and 93 octane fuels, as well as 2 transmission tunes to choose from. Beyond the preloaded tunes, we offer a host of user adjustable parameters, like throttle response, speed limit, tire size, and more. We've even added some new features for drivers of these newer trucks, like the ability to recall your last mode setting!Get power you can feel, with DiabloSport!
Description_FAB 2020-2023 Silverado 2500/3500 6.6 L8T
Description_FAB 2020-2023 Sierra 2500/3500 6.6 L8T
Description_FAB 28 rwhp over stock on premium fuel
Description_FAB 50 rwtq over stock on premium fuel
Description_FAB Tunes for 87 octane, and premium fuel provided
Description_FAB ECM unlock included!
Description_FAB Unlock and Tune, at home!
Description_FAB Preloaded tunes for multiple octane levels
Description_FAB Support for 6.6L L8T applications with 6 speed Transmission
Description_FAB Throttle Boost setting for adjustable throttle feel
Description_FAB Adjust speedometer for larger tires (26"-38")
Description_FAB Calibrate speedometer for gear change (3.42-5.13)
Description_FAB Remove speed limiter for increased top speed
Description_FAB Adjust engine rev limiter for increased RPM range (+/- 400 RPM)
Description_FAB Adjust engine idle speed in Park/Neutral and Drive
Description_FAB ‘Keep Drive Mode Setting’ allows you to select a drive mode and it will remember that mode next time you start the truck!
Description_FAB Adjust fueling at WOT in multiple RPM ranges
Description_FAB Calibrate spark timing at WOT across multiple RPM ranges
Description_FAB Front/Rear TPMS threshold adjustment
Description_FAB Air Filter Monitor system control
Description_FAB Transmissions adaptive relearn
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