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151 reviews


Cat Back Exhaust [Mk7 Fiesta ST]

This part does not affect the base vehicle warranty.

The mountune Cat Back Exhaust for mk7 Fiesta ST reduces back-pressure and improves performance, whilst keeping cabin intrusion / boom to a minimum.

Designed and developed in-house by mountune's engineering team, the cat back exhaust utilises a Helmholtz chamber design in the rear silencer. This helps cancel out unwanted frequencies due to the way in which the exhaust gas waves are reflected. Despite being more complicated and therefore expensive to manufacture, this design ensures back-pressures remains low, providing the optimum in terms of performance, whilst removing as many of the unwanted frequencies and cabin boom as possible.

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

As a mountune Performance product, this is also the only cat back exhaust available for your mk7 Fiesta ST that will not affect the base vehicle warranty, and comes with a limited lifetime warranty* against manufacturing defects.


  • 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 logo
  • Does not affect base vehicle warranty
  • Limited lifetime warranty

Please note: If this product is fitted with mountune Exhaust Isolator, we recommend using two isolators on the silencer only.

Compatible with all 3-door models globally and EU-only 5-door models. Customers in the USA please note there is a 5-door specific version, available at

*Please contact us for warranty terms and conditions.

Customer Reviews
4.9 Based on 151 Reviews
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Filter Reviews:
    United Kingdom United Kingdom
    Cat back exhaust

    Waited a while for exhaust to come back in stock , ( due to covid ) once it did arranged with Fred (fjrs) to install it , car sounds great now more of a deep tone now , start up is not to noisy ( 5 o'clock in morning) but when you put your foot down the noise is fantastic, verry pleased with service from mountune & FJRS , another piece to my 230 kit in the bag , keep up the good work everyone .

    mountune Cat Back Exhaust [Mk7 Fiesta ST] Review
    Paul H.
    United Kingdom United Kingdom
    Quality upgrade

    Perfect in combination with the mp215 kit. Love the subtle sound compared to my previous ridiculous custom side exit exhaust haha

    GS M.
    United Kingdom United Kingdom
    Cat Back Exhaust (Mk7 Fiesta ST)

    Great Quality, easy fit and great sound