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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 either the mountune high-flow panel filter or carbon fibre induction kit, a 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.

Please Note: Whilst every effort is made to provide calibration support for all known available base variants, due to the number in existence, there may occasionally be a delay in enabling support for your vehicle. Should this be the case, options to provide this support will be made available, or you will be offered a full refund until specific calibration for your vehicle can be provided.


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 (which removes a substantial amount of back pressure otherwise found in the exhaust system) and either a high-flow panel filter or our carbon fibre induction kit.


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:
    Lee m.
    United Kingdom United Kingdom


    Right boost for the car along with the recommended hardware! Easy to install and remove if needed great little product.

    Irakli K.
    Germany Germany

    m365, Downpipe and GPF on automatic

    I have installed Downpipe/Sports cat with GPF on my ST with automatic transmission and flashed with m365. The results are beyond great! Significantly improved sound and powerful acceleration! The car even does pops and bangs, at least while stationary in neutral and occasionally while driving. So, if mTune guys put their great minds together the software can probably be modified to offer full scale pops and bangs like on manual transmission. It will be then, perfection ;-)

    Australia Australia


    Great product very easy to use the app and flash the tune. All the added performance with supporting modifications that's recommended It really wakes the car up to a different beast. Comes with a great carry case for OBD dongle to store. Highly recommend