The Edge Evolution CTS3 is the ultimate flash tuner and digital monitor for 2020–2023 Chevy Silverado HD and GMC Sierra HD trucks with the 6.6L L8T gas engine, delivering proven power gains, improved drivability, and advanced control in one sleek package. Every kit comes with the Edge Locksmith tool, allowing you to unlock your truck’s ECM safely through the OBD-II port. Once unlocked, you gain access to preloaded, emissions-friendly calibrations tailored for daily driving, towing, fuel economy, and performance—giving you noticeable horsepower and torque improvements where you need them most. At the heart of the system is the industry-leading CTS3 5-inch touchscreen monitor, providing live data, customizable gauge layouts, and built-in diagnostics to read and clear DTCs. Beyond tuning, the Evolution CTS3 offers an impressive range of adjustable features, including tire size recalibration, speed limiter changes, and more so your truck performs exactly the way you want. The Evolution CTS3 also sets itself apart with advanced transmission tuning support, giving you the ability to optimize shift strategies for heavy towing or aggressive driving. The result is smoother shifting, improved throttle response, and better towing performance for the heavy-duty work your truck was built for. Backed by Edge Products’ 20+ years of tuning expertise, the Evolution CTS3 for the 6.6L L8T gas engine is the smart upgrade for HD truck owners who want affordable power, advanced adjustability, and the industry’s best digital monitor all in one package. A PC and our downloadable Update Agent software will be required in order to complete this unlock and tune process **Device can unlock and tune only one vehicle. Once the ECM is unlocked and flashed, the flash can be returned to factory settings, but the Unlock process can not be reversed. If VIN lock and ECM Unlock has been completed, device is non-returnable