At OG Performance and Tuning, we specialize in taking Jaguar XJ 3.0D 275hp to the next level with meticulously developed ECU remaps. Our engineers carefully analyze each parameter to maximize both performance and reliability. With gains of approximately 50 HP and 55 ft-lb, your vehicle will feel more responsive and thrilling across the entire RPM range. Every calibration is tailored on our advanced dyno and refined on the road to ensure smooth drivability and outstanding power delivery for your daily commute or spirited weekend drives.