OG Performance and Tuning’s advanced ECU remapping for Mercedes-Benz CLS 400d (3.0D) 340hp provides a unique blend of power, smoothness, and reliability. By unlocking approximately 40 HP and 90 ft-lb, our custom tuning ensures that your car feels alive in every gear and every condition. We pay attention to every detail, from throttle response to boost control, crafting a driving experience that’s both exhilarating and refined. Our commitment to precision and safety means you can enjoy spirited drives without compromising reliability, making your vehicle stand out from the rest.