When it comes to diesel performance upgrades, the 2.8L Holden Colorado is one of the most responsive platforms for tuning. This 2017 RG model came into the workshop needing a proper calibration across engine and transmission, and left with a noticeable transformation in power delivery, torque response, and overall drivability. This wasn’t just a “numbers tune” — it was a full setup including ECU tuning, TCU (transmission) tuning, and exhaust valve correction to ensure the eng