Mountune releases performance upgrade for the Focus RS

Mountune’s latest performance kit adds more functionality to the Ford Focus RS and extracts almost 400bhp

Mountune ford focus RS

Mountune has released two new performance upgrades for the Ford Focus RS called the m400R and m400X. Both tunes claim to offer large increases in performance, using the Focus RS’s standard turbocharger and a handful of bolt-on engine modifications.

The m400R is a firmware update for the company’s old m400 tune, adding more functions such as an adjustable RPM limit, a valet mode, full-time launch control and support for full-throttle gear changes. It’s available as a free upgrade to owners of the outgoing m400 tune, or to new buyers for £495.

Best hot hatchbacks

To maintain the Focus RS’s warranty Mountune recommends that buyers install a few supporting modifications for the m400R remap. Extras include an induction kit, an uprated turbo recirculation valve, a larger air-to-air intercooler and a three-inch sports exhaust.

Although not strictly necessary for the m400R tune, for the sake of reliability, Mountune also suggests that buyers fit their engines with forged pistons, stronger bearings, uprated conrods, stronger head studs and a baffled engine sump.

Mountune offers two packages, including all the engine upgrades mentioned here. The upgraded engine ancillaries cost £4,160, while the stronger internals retail for £4,750. Both prices include the cost of fitting and the m400R engine remap.

Should buyers install all the supporting mods, Mountune’s m400R remap claims to reliably deliver 395bhp and 560Nm of torque, which is around 50bhp and 120Nm more than the factory-delivered tune.

For those chasing more performance, Mountune also offers a new m400X tune. It includes all the functionality updates from the m400R and retains the same peak performance figures. However, m400X-tuned Focus RS’s develop peak power and torque for longer in the engine’s rev-range.

As such, there’s more stress on the engine, so Mountune strongly advises customers to opt for both engine upgrade packages, and suggests fitting narrower-gapped spark plugs. On top of the £8,910 for the engine modifications, the m400X remap costs £407.50 fitted.

Now read our review of the Ford Focus RS. Let us know your thoughts in the comments section below…

Most Popular

New 2021 Vauxhall Astra teased for the first time
Vauxhall Astra teaser 1
Vauxhall Astra

New 2021 Vauxhall Astra teased for the first time

The new Vauxhall Astra will get electrified powertrains and a more premium image
8 Jun 2021
New Vauxhall Astra prototype review
Vauxhall Astra prototype - front
Vauxhall Astra

New Vauxhall Astra prototype review

A new Vauxhall Astra is on the way and we've driven a prototype ahead of its official arrival
14 Jun 2021
Illegal car modification hotspots revealed
Volkswagen Polo exhaust
News

Illegal car modification hotspots revealed

Gloucestershire has the highest proportion of illegal car modifications, with altered number plates the most common breach
14 Jun 2021
‘Our switch to electric will soon make driving manual cars a lost art'
Gearknob
Opinion

‘Our switch to electric will soon make driving manual cars a lost art'

Want to drive a manual car? You need to take your test in a manual car. So what happens once all driving-school cars are automatic EVs?
8 Jun 2021
UN report highlights ethical problems with electric cars
Electric car charging
News

UN report highlights ethical problems with electric cars

Analysis reveals lithium refining takes 65 per cent of Chilean region’s water, while 40,000 child miners dig for cobalt in DRC
14 Jun 2021
'The hydrogen underdog disruptor is back in town'
Toyota Mirai opinion
Opinion

'The hydrogen underdog disruptor is back in town'

Mike Rutherford says hydrogen-powered cars could still be a frequent sight on UK roads
13 Jun 2021
New Porsche Macan facelift prototype review
Porsche Macan prototype - front
Porsche Macan

New Porsche Macan facelift prototype review

We get behind the wheel of a prototype version of the facelifted Porsche Macan SUV
13 Jun 2021
Ineos Grenadier prototype 2022 review
Ineos Grenadier prototype
Ineos Grenadier 4x4

Ineos Grenadier prototype 2022 review

Can the Ineos Grenadier really fill the mud-splattered void left by the old Land Rover Defender? We take a first drive in a prototype to find out...
15 Jun 2021
Driving test update to preserve the manual gearbox
Dacia Duster gear lever
News

Driving test update to preserve the manual gearbox

With more drivers learning in autos and electric cars, the DVSA is looking to update the driving test so people can still drive manuals in future
16 Jun 2021
'Factories are at a standstill because they can’t get the parts to finish cars'
Car manufacturing
Opinion

'Factories are at a standstill because they can’t get the parts to finish cars'

Steve Fowler points out the fresh issues facing global car manufacturing
9 Jun 2021
New Nissan Qashqai production begins in Sunderland
Nissan Qashqai - front static
News

New Nissan Qashqai production begins in Sunderland

Nissan will offer every school child in the North East of England a place on the Nissan Skills Foundation course to mark 35 years of manufacturing in …
14 Jun 2021
Volkswagen Golf GTI Clubsport vs Cupra Leon 300
Volkswagen Golf GTI Clubsport vs Cupra Leon 300
Car group tests

Volkswagen Golf GTI Clubsport vs Cupra Leon 300

The capable Volkswagen Golf GTI Clubsport goes up against its new Cupra Leon 300 sibling in this hot hatch battle
12 Jun 2021
New hydrogen-powered Land Rover Defender prototype in development
Land Rover Defender
Land Rover Defender

New hydrogen-powered Land Rover Defender prototype in development

The Land Rover Defender FCEV prototype will be assessed for off-road and long-range zero-emission motoring
14 Jun 2021
New SsangYong Korando e-Motion breaks cover with electric power
SsangYong Korando EV
Electric cars

New SsangYong Korando e-Motion breaks cover with electric power

The new SsangYong Korando compact electric SUV will be on sale later in 2021, says the financially stricken South Korean manufacturer
15 Jun 2021