We recently completed a Stage 1 ECU remap on a BMW M4, delivering a strong and usable increase in performance while maintaining OEM refinement and drivability.

Performance figures:
Stock: 450 hp / 550 Nm
Stage 1: 500 hp / 680 Nm
Increase: +50 hp / +130 Nm

This calibration is focused on real-world performance, not inflated headline numbers.

From factory, the BMW M4 is already a highly capable performance car, but there is still noticeable potential in how the power is delivered. Our Stage 1 remap refines this by increasing torque throughout the rev range, improving throttle response, and delivering stronger mid-range acceleration while maintaining smooth and predictable power delivery.

The result is a car that feels sharper, more responsive, and more connected to the driver, without becoming aggressive or difficult to control. You’ll notice improved response when accelerating, stronger pull through the mid-range, and more confidence when overtaking, all while retaining everyday usability.

Optional add-ons available:
Speed limiter removal
Sports display recalibration (accurate power and torque readings)
ECU unlock for newer locked models

Every vehicle undergoes a full dealer-level diagnostic health check before and after tuning to ensure the engine and ECU are in suitable condition, identify any faults beforehand, and confirm a safe and reliable result.

We provide a fully mobile ECU remapping service across North Somerset and South Wales, covering areas including Weston-super-Mare, Bristol, Chepstow, Newport and Cardiff. We come directly to your home or workplace with no travel charges within our core service area, keeping the process convenient and hassle-free.

Use our Instant BHP Checker on our website to see what your vehicle can achieve, explore tuning options, and get a quick quote.

0% finance options are available, making it easier to upgrade your vehicle.

At MTechTuning, we focus on safe, realistic performance gains with OEM-level refinement and long-term reliability. Every calibration is designed to improve how your vehicle drives every day, not just how it performs on paper.

Get in touch today to book your BMW M4 remap or check your gains online.