Cat Back Exhaust


£499.00 Inc. VAT
£415.83 Ex. VAT

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 139 Reviews
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Samuele D.
Italy Italy


Good quality as always. Thank you Mountune for the quick shipment also in Italy

Philip Lindley

Mountune cat back exhaust

I fitted this system this morning and I must say as a mechanic I found this exhaust so easy to fit it came with all clamps and new bolts and gasket to fit to the cat. The system lined up perfectly first time and it made it easier using the Mountune yellow isolators which I purchased. The quality of the system is excellent the Cmc welding is fantastic. On starting the engine you could clearly hear a much deeper engine note and when driving the car it sounds fantastic just like a fast Ford should sound. Well done Mountune you have produced a fantastic exhaust system I am very pleased indeed with my purchase.

United Kingdom

Cat back exhaust

Easy to fit no problems fitting could make a few more crackles but other then that quality product

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