Unlock AND TuneinTune 3 for 2020-2023 6.6 L8T Unlock and Tune Kit 8266-R
Unlock AND TuneinTune 3 for 2020-2023 6.6 L8T Unlock and Tune Kit 8266-R
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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
Specs:
| Brand | DiabloSport |
|---|---|
| Emission Code | 7 |
| Product Type | Hand Held Programmer |
| Sale Category | Tuners and Programmers |

Policies and FAQs
Return Policy
Fault reasons include but are not limited to:
- Buyer was shipped the wrong product
- Buyer was shipped a damaged product
- The product page had incorrect fitment and the part does not fit the Buyer's vehicle
Opened boxes, plastic bags, and other packaging are not considered damage (excluding single use items such as, but not limited to, liquids, software, and other components that cannot be reused/resealed).
FAQs
|Q. What is an Intermediate Brake Line?
|A. This is the line that runs from the front of the vehicle to the rear. On most vehicles it connects to a junction then you will have rear axle lines. On a few cars the intermediate lines will connect to the rear wheels. It is recommended to change the axle lines if you are replacing the intermediate lines.
|Q. What is included in a pre bent brake line kit?
|A. Our kits include all of the solid metal lines for that section of the vehicle
|Q. I need to return something - what's your return policy?
|A. We are happy to help! Please help us to help you by going to our return form and filling out the form as best as you can in order to request a return.
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Modern Day stands by our parts and is happy to accept returns within 30 days of purchase. Parts must be in new condition.
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If a part arrives damaged, or is defective, Please report it to us immediately. So we can handle it for your promptly.