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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 revised emission hardware to suit EU6.2 regulations. We believe these changes make 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
5.0 Based on 1 Reviews
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Colin F.
United Kingdom United Kingdom
Exactly what I wanted

Brilliantly well made piece of kit. Slightly more crisp a sound in normal mode without being noticeably louder. In sport or race the exhaust tone really helps bring the the sound of the little 3 pot to life. Lovely sporty, raspy tone with the M235 tune I run without ever being droney. Definitely an OEM+ sound without straying into obnoxiously loud territory. Am overall super pleased as it is exactly what I wanted from a system.

mountune GPF-back Exhaust [Mk8 Fiesta ST] Review