The Edge Evolution CTS4 is the ultimate flash tuner and digital monitor for 2020–2023 Chevy Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD trucks with the 6.6L L8T gas V8. Delivering gains of up to 28 horsepower and 50 lb-ft of torque, CTS4 combines proven performance tuning, improved throttle response, optimized shifting, and next-generation vehicle monitoring in one powerful package.* Every kit includes the Edge Locksmith tool, allowing you to unlock the factory ECM/TCM and access Edge's pre-loaded, emissions-friendly performance calibrations. Choose 87 Octane tuning for daily driving and economy or step up to 91 Octane tuning for extreme performance and towing. Whether you're commuting unloaded, hauling equipment, or pulling a heavy trailer, Evolution CTS4 helps the 6.6L L8T deliver stronger acceleration, improved response, and better overall drivability. Evolution CTS4 also features vehicle-specific transmission tuning, with optimized shift strategies designed to improve shift points, shift feel, power delivery, and towing performance. Adjustable features including tire size recalibration and speed limiter changes on supported applications give you even more control over how your HD truck performs. Monitor supported engine, drivetrain, temperature, pressure, and other critical vehicle parameters through customizable digital gauges. Set custom alerts and warnings, log vehicle data, and read and clear supported diagnostic trouble codes directly from the CTS4. Compatible EAS sensors and camera options can further expand the system as your monitoring needs evolve. Backed by more than 20 years of Edge Products tuning expertise, the Evolution CTS4 for the 2020–2023 GM 6.6L L8T gas engine is the all-in-one upgrade for HD truck owners looking for more power, better throttle response, optimized shifting, and advanced digital monitoring. More power. Better response. Smarter monitoring. Take Control with Evolution CTS4. *A PC and Edge's downloadable Update Agent software are required to complete the unlock and tuning process. **Device can unlock and tune only one vehicle. Once the ECM is unlocked and flashed, the vehicle can be returned to the factory calibration, but the unlock process cannot be reversed. Once VIN lock and ECM unlock have been completed, the device is non-returnable.
