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!

Features:

• ECM unlock included!
• Unlock and Tune, at home!
• Preloaded tunes for multiple octane levels
• Support for 6.6L L8T applications with 6 speed Transmission
• Throttle Boost setting for adjustable throttle feel
• Adjust speedometer for larger tires (26"-38")
• Calibrate speedometer for gear change (3.42-5.13)
• Remove speed limiter for increased top speed
• Adjust engine rev limiter for increased RPM range (+/- 400 RPM)
• Adjust engine idle speed in Park/Neutral and Drive
• 'Keep Drive Mode Setting' allows you to select a drive mode and it will remember that mode next time you start the truck!
• Adjust fueling at WOT in multiple RPM ranges
• Calibrate spark timing at WOT across multiple RPM ranges
• Front/Rear TPMS threshold adjustment
• Air Filter Monitor system control
• Transmissions adaptive relearn

Install Instructions:

• For Instructions CLICK HERE

Fitment:

• Chevrolet Colorado Silverado 2500 HD 401/6.6L V8 2020-2023
• Chevrolet Colorado Silverado 3500 HD 401/6.6L V8 2020-2023
• GMC Sierra 2500 HD 401/6.6L V8 2020-2023
• GMC Sierra 3500 HD 401/6.6L V8 2020-2023

Emissions:

• 7 - This part is legal under the provisions of EPA?s Tampering Policy dated November 23rd, 2020. The company has reasonable basis (test results) to verify that this product allows the vehicle to operate within legal emissions standards and is therefore legal to be sold for on-street use in all states that accept the legal provisions of the Clean Air Act and the EPA Tampering Policy. This product is NOT LEGAL FOR SALE OR USE IN THE STATE OF CALIFORNIA. Testing with the California Air Resources Board, in order to achieve 50-state compliance, is pending with CARB. Once testing is complete with California, and an E.O. number is issued, this product will be updated to 50-state legal status.