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Cat Back Exhaust

The mountune Mk7 Fiesta 1.0 Cat Back Exhaust reduces back-pressure and improves performance, whilst keeping cabin intrusion / boom to a minimum.

A Helmholtz chamber design is utilised in the rear silencer which helps to cancel out unwanted frequencies due to the way in which the exhaust gas waves are reflected. Utilising this system, despite being more complicated and expensive to manufacturer, ensures back-pressure remains low, providing the optimum in terms of performance, whilst removing as many of the unwanted frequencies / cabin boom as possible.

The staggered tail-pipe trim adds to the occasion and both trims feature laser-etched mountune 'racing flag' logos.

Due to the outlet position of the tailpipe trims, an aftermarket ST-style, or genuine Ford Fiesta ST lower diffuser section is required to ensure correct visual appearance.


  • High-flow cat-back exhaust design improves performance
  • Engineered Helmholtz resonator for a less intrusive, performance sound
  • High quality stainless construction with CNC welds
  • Staggered, twin-tailpipe trims with laser-etched mountune racing flag logos
  • Limited lifetime warranty*
Note: If this item is fitted with the mountune Exhaust Isolator, we recommend using two isolators on the silencer only.
*Please contact us for warranty terms and conditions.
Diffuser option

Customer Reviews

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    United Kingdom United Kingdom

    Fiesta mk7 ecoboost exhaust

    Great quality exhaust, advertised cat back but it isn't still uses original pipe from cat and middle box had to get the rest made now it great so beware of what you are buying I didn't realise until fitted happy no though

    Matthew E.
    United Kingdom

    1.0 Catback exhaust

    Absolutely great sound from the outside yet minimal cabin noise as described, perfect for anyone wanting for noise from their car yet a still peaceful drive from inside.

    Matthew E. verified customer review of Cat Back Exhaust

    Mountune catback 1.0

    Firstly, I was very happy with delivery time after receiving my order in less than 48 hours after it was placed. I Fitted the exhaust with the standard CAT and it sounds great; cabin noise is to a minimum yet creating a great sound under acceleration and minimal to no sound when cruising/on the motorway. Definitely recommend this exhaust to anyone who wants a bit more sound out of their car but want a quiet cabin. The exhaust itself is very good quality, impressive how neat all of the welds are and the overall finish of the product is great! Another great service from everyone at Mountune. Thanks!