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BMW · Stage 1

BMW M135i Stage 1 (September 2025)

A mobile Stage 1 calibration by MTechTuning, with dealer-level diagnostics before and after tuning.

Published vehicle figures

Stock

326hp

450Nm

Stage 1

380hp

550Nm

Difference

+54hp

+100Nm

Figures published for this vehicle. Results vary with model year, software, fuel and condition, so we confirm what suits your car before quoting.

BMW M135i Stage 1 (September 2025)

This BMW M135i went from 326hp and 450Nm to 380hp and 550Nm with our Stage 1 calibration, a gain of 54hp and 100Nm.

Add-ons

  • Speed limiter solution
  • Sport dial updated
  • Cold start solution

Advanced dealer-level diagnostics were included before and after.

Is the N55 M135i still worth tuning?

Yes. It remains one of the best value fast hatchbacks to tune. We come to you across Bristol, North Somerset, Somerset and South Wales.

About this job

The results

This BMW M135i now makes 380hp, up from 326hp as standard: 54hp more, an increase of around 17%.

Torque rose from 450Nm to 550Nm (+100Nm), which is what you feel most in everyday driving: stronger pull from low revs and easier overtaking.

What the work involved

Stage 1 is calibrated for a car with standard hardware. By refining boost, fuelling, timing and torque requests within the engine's safe limits, it delivers stronger, smoother acceleration and sharper throttle response.

How we carried it out

  • Diagnostic scan for stored faults before any work
  • Stabilised power supply connected while programming
  • Original software read and saved, so the car can be returned to standard
  • Calibration written, then the car checked again afterwards

Thinking about the same for your BMW?

We come to you from our Weston-super-Mare base, across Bristol, Somerset, Gloucestershire, Wiltshire, South Wales and parts of Devon and Dorset. Results depend on the exact car, so we confirm what suits yours before quoting.

BMW M135i tuning Check your gains
  • Dealer-level diagnostics before and after
  • Fully mobile, at home or work
  • Lifetime software warranty and support
  • 14-day money-back guarantee

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Talk through your vehicle

Find out what your car can do.

Share your registration, mileage and what you would like to improve. We're always online to quote and reply, and we'll confirm what is suitable before booking, then come to you. Fully mobile from our Weston-super-Mare base across Bristol, Somerset, Gloucestershire, Wiltshire, South Wales and parts of Devon and Dorset.

Spread the cost: pay just 25% today with Payment Assist. No fee, no interest (£200 minimum spend).

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