When you bring your vehicle to WestTuned Car Mechanic Center, you can rest easy knowing that your vehicle is in professional hands.
2019-2025 | 335 HP -> 435 HP
Westtuned develops precision ECU tuning software for the BMW 840i 2019-2025, crafted to push your engine beyond factory restrictions. Our calibrations are built around real-world dyno data, delivering a smoother, stronger power curve without compromising engine reliability or daily drivability.
Our engineers develop every file using real-world data logging and dyno sessions, ensuring each Stage 1 calibration delivers consistent, repeatable power gains across a wide range of conditions and temperatures.
Stage 1 software pushes your BMW 840i 2019-2025 from the stock 335HP / 369Nm to 435HP / 455Nm — a gain of +100HP, achieved with no hardware modifications required.
From a completely stock BMW 840i 2019-2025 to a fully modified build, Westtuned has the right calibration to match your hardware and unlock the performance you're after.
Choose Westtuned for:
Transform your BMW 840i 2019-2025 with professional tuning software from Westtuned and experience the power and responsiveness your engine was truly built for.
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