The mountune m390 power upgrade for the Mk4/MK4.5 Focus ST takes performance and fun to new, elevated levels and is perfect for those wanting to reliably extract peak performance from their 2.3-litre EcoBoost engine, whilst maintaining drivability and practicality.

The m390 is based around a new hybrid turbocharger which starts life as a new genuine Ford turbo, before having numerous flow- and performance-enhancing upgrades carried out to it, such as a bespoke compressor wheel and 360º thrust bearing.

The end result is response and low-end performance that feels like the OE turbo, combined with mid-range and top-end power and torque that feels anything but like the standard turbo.

The additional wave of torque is delivered across a wide spread in the rev-range which translates into effortless drivability and totally transforms the overall driving experience... and fun-factor.

As this is a hybrid unit based on the OE Ford turbo, installation is a direct swap, like-for-like, which keeps costs and fitting fuss-free. On a similar basis installation of the supporting m390 calibration is applied using our SMARTflash app, OBD Bluetooth adaptor and your smartphone, so it couldn't be simpler - no lengthy dealer visits, no laptop, no wires, no handsets, no hassle!

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.

m390 SMARTflash is also supplied with two specific performance calibrations, a hybrid economy calibration - which has a reduced power output but allows you to safely use 95RON, plus two companion calibrations (standard and anti-theft) which include the following features:

m390 performance calibration

	Increased power and torque (up to 390PS / 600Nm)
	More aggressive launch control strategy
	Enhanced audible exhaust output in Sport / Track modes
	Optimised no-lift shift functionality

Hybrid Economy calibration (95RON compatible)
m390 power calibration
Anti-theft

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

Important: In order to achieve and maintain performance and reliability, the m390 upgrade should be used in conjunction with the hardware listed below and should only be used with 97RON+ fuel. If a lower octane rating of fuel is the only grade available we recommend switching to the supplied Hybrid Economy calibration which can be used on normal unleaded fuel reliably in all scenarios.

Recommended m390 hardware:

Carbon induction kit or equivalent flowing unit
Sport GPF
High-flow 3" downpipe and sports cat
In warmer climates or when used regularly on track, an upgraded intercooler is also highly recommended.

Please note: The phone device and OBD adaptor is shown for illustration of SMARTflash app only, and is not included with this product. This upgrade is for existing vehicles already running m330 or m365 SMARTflash and have the required hardware installed.

As of August 2024, this upgrade is for MANUAL models only. AUTOMATIC support will be added soon.

Mk4 Focus ST