Skip advert
Advertisement

Mountune’s Ford Focus ST has more power than the old RS

UK Ford tuner Mountune has launched its latest upgrade kit for the Mk4 Focus ST

The Ford Focus ST receives little attention these days, but with Mountune’s new m365 upgrade now on the market, that might be about to change. Prices begin at £689 for the tune alone, but recommended hardware brings the total to around £1800.

The Mk4 Focus ST is no slouch on paper, producing 276bhp and a healthy 310lb ft from its 2.3-litre turbocharged four-cylinder. With little modification though, Mountune has managed to liberate an additional 84bhp and 103lb ft over standard, bringing total output to 360bhp and 413lb ft – that’s more power than the now-discontinued Focus RS. Performance figures for the modified car haven’t been disclosed, but expect better than the standard 5.7sec 0-62mph and 155mph top speed (should the limiter be removed). 

Advertisement - Article continues below

> Ford Mustang Steve McQueen Bullitt Edition 2021 review – a 720bhp tribute act

Building upon its existing m330 kit, Mountune recommends the fitment of a high-flow panel filter alongside its 3-inch downpipe, less restrictive sports catalytic converter and ‘sport’ Gas Particulate Filter. Though the exhaust system does see extensive modification, the firm says it has thoroughly tested the kit to ensure cars will pass a UK MOT emissions test even three years after installation.

This being a Ford Focus, retaining daily driveability was high on Mountune’s list when developing the upgrades. As a result, its own SMARTflash smartphone application allows drivers to switch between m365, m330, stock, and anti-theft performance modes to suit the conditions. 

David Mountain, Managing Director of Mountune, said: ‘We are delighted to launch our latest upgrade kit for the much-loved mk4 Focus ST. Ford has done a great job with the stock ST and what we have done with this m365 upgrade kit is to fully optimise the calibration with our newly engineered low-back pressure exhaust hardware – this means maximum performance is available throughout the rev-range and it’s now a seriously fast car, which is also great fun to drive, too.’

Customers that already have Mountune’s m330 kit installed (with supporting hardware) can upgrade for just £99, with new customers paying £1800 for the kit as a whole.

Skip advert
Advertisement

Recommended

Used Ford Focus ST (Mk4, 2019-2025) review – Ford has killed its last remaining hot hatch
Ford Focus front
In-depth reviews

Used Ford Focus ST (Mk4, 2019-2025) review – Ford has killed its last remaining hot hatch

The Mk4 Focus ST went out as an imperfect hot hatchback, but one with appeal and impressive capability if you don’t mind some rough edges
18 Nov 2025
ZeroNine Ford Focus ST review – Ferrari 599 pulling power in a hatchback
ZeroNine Ford Focus ST – front
Reviews

ZeroNine Ford Focus ST review – Ferrari 599 pulling power in a hatchback

Leicestershire tuning firm ZeroNine has given the last-of-the-line Focus ST a new lease of life with a series of performance upgrades – and Ferrari 59…
14 Nov 2025
Used Ford Focus ST Edition (Mk4, 2021 - 2025) review – a Honda Civic Type R rival for £20k
Ford Focus ST Edition
Reviews

Used Ford Focus ST Edition (Mk4, 2021 - 2025) review – a Honda Civic Type R rival for £20k

The Ford Focus ST Edition turns an already-capable hot hatch package to 11, and now you can find used examples for much less than they were when new
10 Oct 2025
After 23 years the Ford Focus ST is dead
Ford Focus ST
News

After 23 years the Ford Focus ST is dead

With the demise of the Focus ST, fast Fords as we knew and loved them are no more
3 Jun 2025
Skip advert
Advertisement

Most Popular

Why the wild V8-powered Land Rover Defender D7X-R has ‘flight mode’
Land Rover Defender Dakar D7X-R
News

Why the wild V8-powered Land Rover Defender D7X-R has ‘flight mode’

The Land Rover Defender will take on the world’s most gruelling off-road race in 2026. Here’s our first look at the car that will do it
25 Nov 2025
How a sub-200bhp runabout exposes the problem with today’s performance cars
695C Turismo
Opinion

How a sub-200bhp runabout exposes the problem with today’s performance cars

A shortage of long-term test cars flags up a wider problem, says Meaden
27 Nov 2025
Everyone loves the idea of a GT car, so why does nobody buy them?
Aston Martin Vanquish
Opinion

Everyone loves the idea of a GT car, so why does nobody buy them?

We all love a great GT, says Jethro. Trouble is, no-one wants to buy them
21 Nov 2025