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16 reviews


GPF-back Exhaust [Mk8 Fiesta ST]

Trim Finish
Model Year

The mountune GPF-back exhaust for the Mk8 Fiesta ST gives the 3-cylinder EcoBoost a much more befitting soundtrack, reduces back-pressure and enhances vehicle aesthetics.

Constructed from 60mm 304 stainless steel, the mountune GPF-back system improves vehicle performance thanks to the low-back pressure design, whilst the carefully engineered muffler features a Helmholtz resonator which ensures the cabin remains free from unwanted drone or boom.

The mountune GPF-back also comes supplied complete with a new exhaust valve assembly, so you can easily swap your actuator across to retain full valve control.

Available with either a polished stainless or carbon fibre trim option to suit your individual preference.

This system also includes an adaptor to join it to the OE exhaust - not shown.

PLEASE NOTE: Pre-September 2020 models use a three-bolt valve-motor fixing. Post-September 2020 models use a single bolt fixing. Please ensure you confirm on your vehicle if you're not sure which you need and then select the correct option required when ordering. 


From the GPF all the way to your choice of polished stainless, or carbon fibre trims, the mountune exhaust system delivers when it comes to quality and detail; from the beautiful TIG welds and engineered features on the outside, to the drone-reducing Helmholtz resonator on the inside, we've got you covered.

Customer Reviews
4.9 Based on 16 Reviews
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Filter Reviews:
    Carl R.
    United Kingdom United Kingdom


    excellent service

    United Kingdom United Kingdom

    Actual Carbon

    Fantastic product, I've gone all out mountune on my Fiesta, so this had to be the one for me. Had it fitted by FJRS and I'm really happy with it. Not offensively loud as reviewed, although I was hoping it might have been a tad louder, so other brands might be worth considering if purely looking for noise. But having waited for mountune to develop this exhaust since the Fiesta ST release, this works well with all the mountune upgrades and knowing it has been designed engineered with performance gains in mind.

    Dave B.
    United Kingdom United Kingdom

    Great Sound

    As a bit of a Mountune addict and as it improves engine breathing, I bought the exhaust upgrade to compliment all the the rest of the Mountune goodies that are installed on the car. As with all things Mountune, the build quality is brilliant, and once again my local and very obliging Ford garage fitted the system. The exhaust sounds fantastic even in normal driving mode but go to sports mode and it sounds brilliant. However, it’s not over the top, it just sounds and performs like a hot hatch should. A highly recommend upgrade even if you don’t have any other Mountune goodies.

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