DiabloSport inTune i3 Tuner Kit with ECM Unlock for 2020-2023 Silverado and Sierra 2500HD 3500HD 6.6L L8T Gas - 8266-R

The DiabloSport 8266-R is a tuner kit for 2020-2023 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD trucks with the 6.6L L8T gas V8. It pairs the inTune i3 color touchscreen handheld with the locksmith device and ECM harness needed to unlock the factory-locked ECM in the driveway.

Compared with the Predator 2 version, the i3 adds a larger touchscreen, Wi-Fi updates and more user-adjustable parameters. Included tunes for 87 octane and premium fuel deliver up to 28 rear-wheel horsepower and 50 lb-ft over stock on premium, with calibrations for the 6-speed automatic.

Vehicle compatibility

• 2020-2023 Chevrolet Silverado 2500HD and 3500HD with the 6.6L L8T gas V8
• 2020-2023 GMC Sierra 2500HD and 3500HD with the 6.6L L8T gas V8
• Handheld with buttons instead: Predator 2 7266-R; dash-mounted monitor: Trinity 2 9266-R

Tuning and adjustment features

• ECM unlock hardware included; unlock and tune at home
• Preloaded 87 octane and premium tunes with 6-speed transmission calibrations
• Adjust wide-open-throttle fueling and spark timing across several RPM ranges
• Rev limiter plus or minus 400 rpm, speed limiter removal, idle speed in Park/Neutral and Drive
• Speedometer correction for 26-38 inch tires and 3.42-5.13 gears, Throttle Boost
• Keep Drive Mode Setting holds your drive mode between starts
• TPMS threshold adjustment, air filter monitor control, transmission adaptive relearn
• Wi-Fi updates, data logging, read and clear trouble codes

What is in the box

• inTune i3 touchscreen programmer
• Locksmith unlock device
• ECM unlock harness
• OBD-II and USB cables
• Instructions

Installation and limitations

Unlock the ECM once with the locksmith and harness, then tune through the OBD-II port with the i3. After the unlock the locksmith hardware is no longer needed. Not for use in California.

Specifications

• Part number: 8266-R
• Brand: DiabloSport
• Emissions: Not legal for sale or use in California
• Warranty: 1 year manufacturer warranty
• Country of origin: United States
• Packaged size: 6 x 5 x 3 in, 2 lb
• UPC: 810065217394

Frequently asked questions

What is the difference from the 7266-R?

Same unlock hardware and the same power. The 8266-R uses the inTune i3 touchscreen handheld, which adds Wi-Fi updates and more adjustable parameters; the 7266-R uses the button-operated Predator 2.

How much power does it add?

DiabloSport publishes up to 28 rwhp and 50 lb-ft over stock on premium fuel.

Can I load custom tunes later?

Yes. The inTune i3 accepts custom tunes from DiabloSport's CMR dealer network.

Do I have to remove the ECM?

No. The harness connects to the module in the truck.