The mountune GPF-back exhaust for the Mk8/ Mk8.5 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 (see valve assembly guide here). 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.