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BMW · Stage 1

BMW M135i N55 Stage 1 (February 2026)

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

Published vehicle figures

Stock

320hp

450Nm

Stage 1

380hp

550Nm

Difference

+60hp

+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 N55 Stage 1 (February 2026)

This BMW M135i went from 320hp and 450Nm to 380hp and 550Nm with our Stage 1 calibration, a gain of 60hp and 100Nm.

The punch it always should have had

BMW leaves a lot on the table with the N55. Stage 1 wakes the car up, with sharper response, harder boost through the mid-range and much stronger pull in every gear. Overtakes need less planning and the car feels lighter on its feet.

Smooth, not jerky

Power delivery stays smooth and controlled, exactly how an OEM+ tune should feel.

ECU and tools

This car has a Bosch MEVD17.2.G ECU and was tuned through the diagnostic port with AutoTuner, with no bench work.

Included

  • Speed limiter solution
  • Sports display enabled

Can you tune an M135i without removing the ECU?

On this ECU, yes. We come to you across Bristol, North Somerset, Somerset and South Wales.

BMW M135i N55 Stage 1 (February 2026) photographed by MTechTuning
  • Dealer-level diagnostics before and after
  • Fully mobile, at home or work
  • Lifetime software warranty and support
  • 14-day money-back guarantee

More recent jobs

More BMW work, with published figures.

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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.

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