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6 reviews


GPF-back Exhaust [Mk8 Fiesta ST]

Trim Finish

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: Vehicles built after September 2020 use a revised exhaust / exhaust valve assembly which makes our current GPF-back valved exhaust non-compatible. Support for this latest level will be made available soon. If you are unsure please email us with your VIN and we will check compatibility for you.


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
4.8 Based on 6 Reviews
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Filter Reviews:
    Anthony L.
    United Kingdom United Kingdom
    Carbontastic MK8 Mountune Exhaust

    I visited Fred & Jonny at FJRS (Mountune HQ) to have my MK8 Fiesta ST exhaust fitted today. Firstly, a massive thanks to Fred for fitting me in last minute and also a massive thanks to both the boys for fitting an excellent exhaust system to my car. This looks absolutely lovely with the carbon tips poking out of the rear and the sounds that it gives you when you drop a gear and give it some is to die for! It can be very civilised when cruising along and not at all boomy in the cabin but you can still tell you’ve got an updated exhaust system when moving along. The fun kicks in when you give it a hoon as the pops and bangs are much more prominent over the standard system which you would hope to expect. Overall, I’m very happy and satisfied and this now tops of my MK8 full list of Mountune upgrades!

    mountune GPF-back Exhaust [Mk8 Fiesta ST] Reviewmountune GPF-back Exhaust [Mk8 Fiesta ST] Review
    United Kingdom United Kingdom
    GPF back exhaust carbon tipped

    Good quality item with extremely quick delivery. Can’t wait to get it fitted now

    mountune GPF-back Exhaust [Mk8 Fiesta ST] Review
    Portugal Portugal
    Exceeded my expectations!

    Very well packaged and with the usual mountune quality. Very happy as it's not obnoxiously loud but with a noticeable raspier tone. No big difference in cold start and normal mode. No drone in Sport/Track modes. The tips look beautiful and are perfectly sized unlike other options on the market. Exhaust valve makes less noise then the stock one, which was a nice surprise and very welcome. Giving 4 stars just because it isn't TUV approved and it should.