Focus ST and Fiesta ST hot hatches just got hotter with the introduction of official Mountune upgrades. The packages are developed by race engine and road-car performance specialist Mountune, and boost output from the Focus ST’s 2.0-litre EcoBoost engine to 275PS.

Ford is also offering an official Mountune upgrade for the Fiesta ST, which will increase maximum power to 215PS*, enabling 0-62mph acceleration in 6.7sec, compared with 6.9sec on the factory model.

The Mountune upgrades boost both Focus ST and Fiesta ST in-gear acceleration too. Peak Focus ST torque, heightened to 400Nm, improves 31-62mph acceleration in fourth gear by 0.8sec to 4.9sec, while peak Fiesta ST torque, enhanced to 320Nm*, improves 31-62 mph acceleration in fourth gear by 0.7sec to 5.7sec.

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Any of the UK’s 120 Mountune-appointed Ford dealers will be able to fit the upgrade – in under 60 minutes for the Fiesta ST, and less than 90 minutes for the Focus ST. Both are fully compatible with the Ford warranty, meaning Mountune modified vehicles continue to be covered against mechanical failure for three years or 60,000 miles from the original date of purchase.

The Focus ST Mountune upgrade includes a cast alloy inlet duct (silver or black powder coat finish), high-flow air filter element, larger alloy intercooler (silver or black powder coat finish) and unique calibration. The Fiesta ST version has a re-modelled air box base with secondary inlet duct, a high-flow filter element and unique calibration.