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Vehicle Info NeededSUPERCHIPSPART NUMBER: 848-2866-F
Flashpaq Tuner with ECM Unlock Kit for 2020-2023 Chevy Silverado and GMC Sierra 2500 HD/3500 HD 6.6L L8T
$73195$813.95You Save$82.00
Ships on Sep 03, 2026
Lowest Price GuaranteeFlashpaq Tuner with ECM Unlock KitFits 2020-2023 Chevy Silverado and GMC Sierra 2500 HD/3500 HD 6.6L L8T Gas Engines Gains up to 28 HP and 50 TQ on Premium Fuel Sold as a Kit
Factory-locked ECMs put late-model GM tuning out of reach - this kit solves that at home. It pairs the Flashpaq handheld tuner with a Locksmith ECM unlock device and harness so you can unlock and tune your 2020-2023 6.6L L8T gas HD truck in your own garage.
Superchips 2866-F Performance Features:
- Supports 2020-2023 Silverado and Sierra 2500 HD/3500 HD with the 6.6L L8T gas engine.
- Delivers up to 28 rear-wheel HP and 50 rear-wheel TQ over stock on premium fuel.
- Performance TCM tune optimizes transmission behavior.
- Corrects the speedometer for tire size and final drive ratio changes.
- Adjusts rev limiter, idle RPM, throttle sensitivity and removes the speed limiter.
Part TypeProgrammer
BrandSUPERCHIPS
Package Height3.0
Package Width5.0
Package Length6.0
Weight2.0 PG
Part CategoryPerformance Parts
Erases Fault CodeYes
Color DisplayYes
Software IncludedYes
QuantitySold as a Kit
Part FitmentDirect Fit
Fuel TypeGas
Vendor Part Number2866-F
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
