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MR300 (mTune only) [Mk3 Focus ST]

Calibration: MR300

This option is for customers with a Mk3 Focus ST and wish to upgrade to MR300 using an mTune, and who fall into one of the following three categories:

  1. MP275 customers who have all the required hardware installed for MR300 but require an mTune and MR300 calibration.
  2. MT275 customers who have all the required MR300 hardware (including an mTune) but require an in-field firmware update to their existing handset.
    In-field firmware updates are facilitated via a bespoke upgrade key. Once ordered we will send you steps to follow in order for you to provide us with your specific mTune serial number. A key will then be generated and sent to you which will enable you to update your mTune's firmware using the AP Manager software.
  3. Customers running all the required MR300 hardware but using standard software, requiring mTune with MR300 calibration.

Required hardware list:

  • mountune alloy intercooler
  • mountune induction kit
  • mountune high-flow induction hose
  • mountune charge pipe upgrade kit
  • mountune downpipe / sportscat
  • mountune cat-back exhaust 

Please note: Installing the MR300 calibration without the correct hardware list above may result in failure to make the quoted power / torque figures, abnormal running, detrimental fuel consumption or engine warning light illumination. In any such instance no warranty is offered or implied by mountune.

mTune features:

  • ECU performance calibration transfer
  • In-field calibration updates
  • 0-60 times
  • ¼ mile times
  • Monitor 6 OBD channels
  • Adjustable shift light
  • Full data logging
  • DTC reading / clearing
  • Soft touch rear case
  • LCD screen
  • Lanyard pin
  • Removable faceplates
  • Ambient light sensor

Each mTune is supplied complete with:

  • Holster with t-slot mounting
  • OBD and USB connection cables
  • Black faceplate
  • mTune zip-up case

Please note: This calibration version is not compatible with vehicles in the USA. Please visit mountune USA website at

Customer Reviews
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    Germany Germany

    Great performance.

    I had the MP275 and the MR300 tune. Both are very good to drive. For me the montune software ist the best i had driven on the Focus MK3 ST.

    United Kingdom United Kingdom

    M300 Ford Fokus mk3 st

    Great product!!! Thank you!!!

    United Kingdom United Kingdom

    Satisfied Customer

    Whooosh!! The 275 kit is decent, adding a worthwhile extra 25PS/40Nm over standard, but you could just save time, add the additional hardware and jump straight in for for the MR300 calibration, taking it up to 300PS/470Nm, you won't be disappointed. Some may think 50PS/110Nm gain over stock trim is marginal, but when you feel it kick in, you'll come to the quick realisation that it's actually a bit special. MR300 totally transforms the drive, add a Quaife ATB diff into the mix and it becomes the car you always wanted.

    mountune MR300 (mTune only) [Mk3 Focus ST] Review