Discover the true potential of your BMW 4 serie 420d 184hp with OGPT's bespoke ECU tuning solutions. By focusing on optimizing fuel delivery, ignition timing, and turbo control strategies, we extract an impressive extra 36 HP and 45 ft-lb. Our approach goes beyond simple power gains — we also enhance throttle response and overall driving feel. Whether you're chasing track-day performance or a more dynamic street experience, our custom tunes are designed to transform your car while maintaining OEM-level safety and reliability.