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MR300 (mTune only) [Mk3 Focus ST]

Calibration: MR300

This option is for customers who wish to upgrade their facelift (2015>) Mk3 Focus ST 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

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    United Kingdom United Kingdom


    Upgraded from MP275 to MR300, totally transforms the car, excellent product from Mountune.

    Ross s.
    United Kingdom United Kingdom


    Installed the mr300 this morning, it did not take long to install and we went for a drive, worked a treat and is a good bit of kit.

    Mark W.


    Great service from Mountune HQ again. The MR300 tune is a map that works well within the safety perimeters of the cars capabilities, and when driving around town feels quite stock. It has a linear feel to it, smooth but quick acceleration throughout the rev range and gear box. Its definitely at its happiest in 4th gear at 5500 rpm where its just a beast! Coupled with all the bits that make up the MR300 pack and a Quaife differential, RS Clutch and Re-circulation valve which were of course fitted by Mountune, its a real treat to drive. All in all a quality product supplied by Mountune yet again, thanks guys.