Experience a new level of performance with Stealth Performance Products' tuning solutions, exclusively designed for the GMC Sierra 5.3L (2019-2021). With the stock L84 5.3L Sierras' in mind, we meticulously developed these tunes to elevate your overall driving experience. Feel the surge of power at wide open throttle and notice the refined improvements at the bottom end, with enhanced throttle response and more rapid shifting. Additionally, you'll notice the low-end torque production, ensuring your Yukon performs at its peak potential.
Programming the Stock ECU with our calibration will net you up to 20 HP with just a flash! (results vary based on modifications and other variables).
An RTD is a "remote tuning device". Simply put, this device allows us to easily send our tunes over to you. Even more than that, it allows you to data log after our tune is installed to make sure everything is good to go!
A tune, otherwise known as calibration, is a file written to the computer in your vehicle that runs your engine. This control module is sometimes referred to as the Engine Control Module (ECM), Power Control Module (PCM), or Engine Control Unit (ECU).
The tuning process will void the factory warranty related to that modification. For example, if your windows stopped rolling up, this should still be covered since it is not controlled by the ECM.