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mTune SMARTflash m365 Upgrade [Mk4 Focus ST]

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The mountune m365 power upgrade for the manual and automatic Mk4 Focus ST takes power and torque to another level, delivering effortless performance, even more drivability and a soundtrack that really befits Ford's flagship ST model.

Utilising the required, carefully engineered hardware upgrades to reduce a substantial bottleneck in the exhaust system, the m365 calibration fully optimises this available headway and increases peak power to 365PS, with torque raised to a substantial 560Nm.

As with all mountune upgrades, it's had to pass our own stringent durability testing criteria, which included tens of thousands of miles and many months accumulating extensive data based on different driving scenarios from road to track and when used on different fuel octane ratings to ensure engine robustness, so you can still have complete peace of mind.

Careful attention has been paid to ensure that whilst brutally fast, m365 is still compliant, refined and useable on an every day basis - equally, the way in which the torque is produced and spread across the rev-range means you'll get instant response regardless of where you are in the rev-range and a top end that's rewarding to rev.

As with our previous m330 calibration, m365 is applied using our mTune SMARTflash app, so programming your ECU is also an easy DIY job; all you need is our app, the supplied Bluetooth OBD interface and your Smartphone; no laptop, no wires, no handsets, no problem!

The latest version of SMARTflash also provides additional functionality, such as: fully configurable gauge displays using the OBD data-stream, comprehensive data-logging and a built-in performance meter, too.

m365 SMARTflash includes four calibrations, with unique functionality:

  • m365 performance 
Increased power and torque (365ps / 560nm)
More aggressive launch control strategy
Enhanced audible exhaust output in Sport / Track modes (manual only)
Custom Track Mode (recalibrated wet-mode for track settings minus pops and bangs)  Manual Cars Only
  • m330 performance 
Increased power and torque (330ps / 515nm)
More aggressive launch control strategy
Enhanced audible exhaust output in Sport / Track modes (manual only)
Custom Track Mode (recalibrated wet-mode for track settings minus pops and bangs)  Manual Cars Only
      • Stock performance
      • Anti-theft

Please note: in order to update to our SMARTflash V2 release, you will now need to download our partner app, ECU Connect - once 'mountune' is selected within the tuner menu of the app you will have full access to the SMARTflash V2 features.

For assistance setting up and installing SMARTflash V2, please refer to the user guide, here.

The m365 calibration has been fully optimised to utilise the mountune high-flow panel filter, 3" downpipe sports cat and 3" sport GPF (3" GPF-back exhaust also strongly recommended) and is compatible with all known regional variations including manual and automatic transmission options.

Using the m365 calibration without the suggested supporting hardware will not produce the published power and torque increases and is not recommended.

Installed or removed in minutes, anywhere in the world, you could say the power's in your hands, quite literally!

The iPhone device is shown for illustration of SMARTflash app only, and is not included with this product.


Fully optimising the reduction in back-pressure achieved from installing the new 3" downpipe sports cat and sport GPF has allowed the calibration team to increase peak power to 365PS, with torque raised to a substantial 560Nm, all whilst maintaining drivability and retaining practicality for daily drivers.

Recommended hardware

To help achieve the power and torque figures indicated and to ensure maximum reliability and a degree of headway remains, the m365 should only be used with a 3" high-flow downpipe, sports GPF and high-flow panel filter (which removes a substantial amount of back pressure otherwise found in the exhaust system).


Already running our m330 calibration, or perhaps your car's standard and you're not sure which option is right for you?

Follow our look-up chart to see what your next calibration step is and which hardware you need to consider with it.

please note: all hardware is supplied as standard with a 12-month, 12,000-mile warranty against manufacturing defects.
installing the m365 calibration without the correct hardware may result in failure to achieve the quoted power / torque figures, abnormal running, detrimental fuel consumption or engine warning light illumination or, in extreme circumstances, damage to and / or failure of the engine. in any such instance no warranty is offered or implied by mountune.

by purchasing this product you agree for mountune to send you emails about new updates or technical features relating to SMARTflash. you can opt out at any time.

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Filter Reviews:
    James F.
    United Kingdom United Kingdom

    M365 smartflash

    Excellent service and quality. Would highly recommend

    Switzerland Switzerland

    SMARTflash m365

    The increase in performance is clearly noticeable. Programming is very easy. I can really recommend it

    Germany Germany

    Top Leistung mit der m365

    Die m365 macht richtig Spaß. Die Leistung ist Top. Auf der Deutschen Autobahn geht der Focus ST jetzt wie man sich ihn vorstellt. Alles richtig gemacht Mountune. Ich kann sie m365 nur empfehlen.