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m400X (mTune only) [Mk3 Focus RS]

Calibration: m400X

The mountune m400X optimises all available headroom on the Mk3 Focus RS, to provide the most exhilarating performance available whilst retaining the OE turbocharger.

This option is for customers who already have the hardware required for m400X installed and require an mTune handset with calibration(s) to m400X firmware - please see below options for more details. 

Calibration Options:

  • M400X - This option includes the mtune handset which comes pre-loaded with the m400X files
  • M400 > M400X (in-field update) - Electronic Download - This option is for customers with our original m400 calibration (Handset Firmware FMR03)
  • M400R > M400X - Electronic Download - This option is for customers with our m400R calibration (Handset Firmware FMR04)

Due to the increased cylinder pressures, this calibration should not be used on vehicles that have not been upgraded with forged pistons, steel conrods and that are using a colder spark plug. 97RON+ fuel should also be used to maintain performance.

Additional functionality:

  • Adjustable RPM limit
  • Full-time launch control (no need to activate via the menu system)
  • Adjustable launch RPM setpoint
  • Full-throttle (no throttle lift) gear change
  • Valet and anti-theft modes
  • Dyno mode (RDU On / Off)
  • Full access to all OBD channels to use with custom gauges / data-logging

mTune Features:

  • Supplied complete with five user-interchangeable calibrations:
  1. Map slot 1 = m400X calibration
  2. Map slot 2 = m400R calibration
  3. Map slot 3 = OEM power calibration
  4. Map slot 4 = Fuel economy calibration
  5. Map slot 5 = Valet mode
  • In-field calibration updates
  • 0-60 times
  • ¼ mile times
  • Monitor all available OBD channels
  • Adjustable shift light
  • Full data-logging
  • DTC reading / clearing
  • Soft touch rear case
  • LCD screen
  • Ambient light sensor

Required m400X Hardware 

  • mTune handset
  • High-flow induction kit
  • Sound Suppression Chamber (SSC)
  • Uprated turbo re-circ valve
  • High-flow hard pipe
  • High-performance alloy intercooler
  • 3" downpipe with 200-cell sports catalyst
  • 3" V3 cat-back exhaust
  • Forged pistons
  • Steel conrods
  • Uprated (1 step colder) spark plugs

    Please Note: The warranty of the vehicle being updated with this upgrade may be affected. The m400X upgrade kit is not Ford-endorsed. 

    To maintain any warranty provision otherwise entitled to you, and to ensure correct operation and reliability, calibrations loaded via an mTune handset must be installed together with the correct mountune® hardware.

    NOT COMPATIBLE with vehicles in North America. Please visit mountune USA website for compatible Focus RS products -

    Customer Reviews
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    Filter Reviews:
      Ian N.
      United Kingdom United Kingdom


      had the 400x fitted today with all the other supporting mods on the car going from fpm375 to 400x shockingly fast even from standstill it pulls hard , mid range you have to have a firm grip on that steering wheel really impressed well done the mountune team


      Track Beast!

      After a full Mountune engine rebuild last year (original engine self-destructed on track), the car has performed well on track days with the M400 map. Last month the map was upgraded to M400X which impressed straight away on the drive home, matching 2 bikes off the lights until I backed off – pretty sure it wouldn’t have done that before! The proper test is now complete following a track day at Donington. The amount and spread of torque across the rev range is incredible compared to the basic M400 map. The power delivery gives you the impression it has around 450-475BHP, in fact it is so good that I believe any more power would ruin the balance of the car. Mountune have definitely hit the sweet spot with this conversion, turning this RS into a track beast! Roll on the next track day.

      Davey F.

      Early days

      Had the M400X flashed today in conjunction with 500 mile oil change post forged internals fitted last January. Steady driving for next few weeks before I can unleash the beast.