The DiabloSport inTune 3 8266-R is a complete unlock-and-tune kit for 2020-2023 GM 2500 and 3500 trucks with the 6.6L L8T gas engine, which ship with a locked ECM. The kit includes the inTune 3 handheld tuner along with the DiabloSport Locksmith device and the harnesses required to unlock the ECM at home. Once unlocked, the inTune 3 loads dyno-tested tunes that add up to 28 rear-wheel horsepower and 50 rear-wheel torque over stock on premium fuel.
Specifications:
- Product line: DiabloSport inTune 3 handheld tuner
- Type: ECM unlock-and-tune kit
- Includes: inTune 3 tuner, Locksmith device and ECM harnesses
- Gains up to 28 RWHP and 50 RWTQ over stock on premium fuel
- Preloaded tunes for 87 octane and premium fuel
- Supports 6.6L L8T applications with the 6-speed transmission
- Adjustable speedometer for 26-38 inch tires and 3.42-5.13 gearing
- Adjustable rev limiter, speed limiter, idle speed and throttle feel
- WOT fueling and spark timing adjustment across multiple RPM ranges
- Application: 2020-2023 GM 2500/3500 6.6L L8T
- Part number: 8266-R
Fitment: Fits 2020-2023 Chevrolet Silverado 2500 HD and 3500 HD and GMC Sierra 2500 HD and 3500 HD trucks with the 6.6L L8T gas engine.
Emissions compliance: This part is legal for on-street use under the EPA Tampering Policy of November 23, 2020 in states that follow that policy. It is not currently legal for sale or use in California, where CARB testing is pending. A California Proposition 65 warning applies.
FAQ
What does the DiabloSport inTune 3 8266-R kit include?
The kit includes the inTune 3 handheld tuner, the DiabloSport Locksmith device and the harnesses needed to unlock the ECM on 2020-2023 6.6L L8T GM trucks.
Which trucks does the 8266-R fit?
It fits 2020-2023 Chevrolet Silverado 2500 HD and 3500 HD and GMC Sierra 2500 HD and 3500 HD trucks with the 6.6L L8T gas engine.
How much power does the inTune 3 add?
DiabloSport rates the tunes at up to 28 rear-wheel horsepower and 50 rear-wheel torque over stock on premium fuel.
Can the ECM be unlocked at home?
Yes. The included Locksmith device and harnesses allow the ECM to be unlocked in the driveway, with no shop visit required.
Is the inTune 3 8266-R legal in California?
It is not currently legal for sale or use in California, where CARB testing is pending. It is intended for on-street use under the EPA Tampering Policy in states that follow that policy.
