Nforcd BMW M4 S55 ECU Remap Software Custom Tuning, Stage 1 500 bhp / Stage 2 520 bhp+, Dyno Proven, Bench Unlock (UK)

BMW M4 S55 Performance Software Calibration - Stage 1 approx 500 bhp, Stage 2 520 bhp+

Unlock the full potential of your BMW M4 S55 with a bespoke engine control calibration crafted for strong, repeatable gains and superb drivability. Developed alongside a leading European calibrator and verified on a hub dyno, this performance software sharpens response, builds confident mid range shove and retains reliability for fast road and track.

Why this upgrade

• Bespoke mapping built around your specific car and hardware - not a one size fits all file.
• Hub dyno tested with before and after printouts so you can see exactly what your M4 is delivering.
• Pre tune health checks to confirm everything is in good order prior to flashing.
• Bench flash unlock available for later locked ECUs, so even newer cars can be calibrated safely.
• Road and dyno validation for smooth, linear power and crisp throttle without sacrificing daily usability.

Expected power

• Stage 1: approximately 500 bhp
• Stage 2: approximately 520 bhp+

We run this calibration on our own car and feedback from customers has been consistently positive. Expect stronger mid range punch, quicker spool, sharper pedal feel and a refined, progressive power curve that makes the M4 feel alive while keeping safety front and centre.

Optional features on request

• Cold start delete
• Adjustable exhaust burble levels
• GTS style start up roar
• Additional personal preferences can be incorporated

How the process works

• Initial inspection and baseline runs to log performance and ensure the car is healthy.
• Creation of a fully custom map tailored to your goals and fuel grade.
• Multiple hub dyno sessions to confirm consistent gains and thermal control.
• Final road validation for smooth part throttle, clean transitions and reliable operation.

Professional installation and booking

For flashing, dyno testing and bench boot unlock, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk. We are happy to discuss your build, supporting hardware and timelines.

Designed for the BMW M4 S55

Built specifically for the BMW M4 fitted with the S55 engine. Unsure about compatibility or supporting mods for Stage 2 Please contact us before booking and we will advise.

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