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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. 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
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Filter Reviews:
    Greg T.
    Australia Australia

    13 ST Exhaust.

    Love the new exhaust, sounds Awsome. Would recommend replacing the cat down pipe at the same time, as my stock one was slightly damaged in the removal of the stock exhaust, due to punching out the factory rivet type bolt, but luckily was savable. Overall, prompt hassle free dilevery, stellar product, and would absolutely recommend this with the air filter upgrade as I done at the same time.

    Brendan V.
    Australia Australia

    Cat Back Exhaust

    Tom from Mountune Australia was very helpful after I had a bad experience purchasing the item from another retailer. He kindly looked after me and sent me the tracking and shipment details soon after I made the purchase. I received the item about 1.5 weeks later on a Friday and had the Exhaust installed the following morning. I am very happy with it. Thanks again to Tom and Mountune Australia! I would definitely recommend them.