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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.

Customer Reviews
4.9 Based on 168 Reviews
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    United Kingdom United Kingdom

    Mk7 ST Cat back Exhaust system

    Fabulous build quality and easy fitting

    mountune Cat Back Exhaust [Mk7 Fiesta ST] Review
    Derek R.
    United Kingdom United Kingdom

    Mrk 7 Fiesta st cat back exhaust

    First of all I’d like to say what a brilliant looking piece of kit, sounds amazing on start up and good inside the car.Has a nice tone to it and has no drone at motorway speed.Had a bit of a problem getting the two nuts off to remove the old exhaust,but using some WD40 soon got that sorted,after that it was easy fitting the new one.If you’re been thinking of buying it, do it you won’t be disappointed .

    Michael W.
    United Kingdom United Kingdom

    Fantastic bit of kit

    Build quality outstanding. Perfect welding. Sounds great in action.