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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 171 Reviews
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Filter Reviews:
    John SVG verified by SHOP
    United Kingdom United Kingdom

    This is a top quality replacement sports exhaust that gives a nice deep tone without being offensively loud. It does boom a bit more than I was expecting at certain revs but not a problem though. Comes with all fittings needed. Quick delivery too!

    Anthony B.
    United Kingdom United Kingdom

    Quality product.

    Easy to fit and very well made. Arrived quickly and expertly packaged. I had to cut a 10mm slot in the old cat ****** to remove the existing corroded studs. One readjustment was needed to stop a slight knocking. Maybe I should have used the Mountune isolators on the silencer as advised. Very happy.

    Simon P.
    United Kingdom United Kingdom

    Good upgrade

    I done a lot of research about this, the sound is exactly what I want, a bit more than the standard sound but nothing too “farty” or that rubbish “pop & bang” tosh. Again, haven’t had a chance to fit it yet but will get it done ASAP.