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GPF-back Exhaust [Mk4 Focus ST] - Fully Fitted

Tailpipe Option: Polished
Model: Hatchback

The mountune GPF-back exhaust for the Mk4 Focus ST utilises a 3" bore which improves vehicle performance (particularly once power output has been raised) thanks to the low back-pressure design, whilst the carefully engineered internal muffler ensures this system remains free from intrusive cabin boom, and at the same delivers an addictive soundtrack.

Also available with either a polished, or carbon fibre, tailpipe trim option to suit your individual preference. Options suitable for both hatchback and wagon variants.

This product includes a fixed labour charge for installation at mountune HQ in Hutton, Essex. This is a comprehensive drive in, drive out service, where you can make use of our comfortable and spacious customer waiting area while the work is being carried out.

Fitting time: 1 hr, 30 mins

For full product information, click here.

Please note: the price shown for this product includes installation at mountune HQ only, and is not transferrable to any other dealer or installer.

Please specify your preferred installation date in the 'notes' section when checking-out; our workshop team will then contact you to confirm this date. If we can't accommodate your preferred choice, the team will discuss other available dates.


Yes, our 'hub' boasts a comfortable waiting area with ample seating and workspace, free Wi-Fi, complimentary coffee and snacks, plus it features a large selection of our products and engines on display, too.

With over 40-years of designing, producing and fitting ECU/TCU software, components and engines, there is no better choice than mountune to have your performance parts fitted. Just like you, we're all petrolheads and treat your pride and joy with the care and attention that it deserves (as if it were our own car), so you can have complete peace of mind of not only the highest levels of workmanship, but that the people that designed the hardware or software are also installing it as originally intended.

You'll also be able to collect and spend mountune reward points too, helping you save money.

For all of our garage services our labour rate is currently £90 per hour (£75 +VAT).

Yes, when you choose mountune to install your performance parts and ECU/TCU tuning, not only can you spend any mountune reward points you've collected (in the usual way), you'll also earn mountune rewards too. So you can save more and spend less, regardless of how you shop with us.

Yes, we offer a comprehensive service for your Ford or VAG model using manufacturer approved or supplied parts, in accordance with our extensive schedule. Please see our separate servicing products, which can be added to your basket and booked individually, or together with performance upgrades.

It's also the only place you'll get a 'mountune' stamp in your book!

If you have other hardware you'd like installed together with your mountune upgrades please let one of our workshop team know and we'll do our best to accommodate you.

Our workshop currently operates Monday - Friday, 8.00am - 5.00pm. If you have any special requirements around dropping off or picking up your vehicle, please just let us know and we'll do our best to accommodate you.

Yes, whilst booking an upgrade or service online is the best way to secure products and services in our workshop, you'll normally be able to add additional performance parts on the day as well, should you wish.

Customer Reviews
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Filter Reviews:
    Gary H.
    United Kingdom United Kingdom

    Exhaust carbon tips

    I after a lot of reviews back Exaust system I devotion go to Mountune's hq. Great service from Ryan and his team . The exaust with carbon tips looks spot on and sounds just right , Quality sound not really boy **** sound just right .

    Jason A.
    United Kingdom United Kingdom

    Cat back

    Took advantage of the free fitting and had the polished tipped cat back fitted. Great experience with nice waiting area and great customer service. Looks a lot better now over the standard factory fitted exhaust tips!!

    mountune GPF-back Exhaust [Mk4 Focus ST] - Fully Fitted Review
    Gary C.
    United Kingdom United Kingdom

    Exhaust for Ford Focus St Mk. 4

    Absolutely fantastic service, extremely knowledgeable technicians, very welcoming and great facilities. Would recommend.

    mountune GPF-back Exhaust [Mk4 Focus ST] - Fully Fitted Review