Cat Back Exhaust


This part does not affect the base vehicle warranty.

The mountune Performance cat-back exhaust reduces back-pressure and improves performance whilst keeping cabin intrusion / boom to a minimum.

A Helmholtz chamber design is utilised in the rear silencer which helps cancel out unwanted frequencies due to the way in which the exhaust gas waves are reflected. Utilising this system, despite being more complicated and expensive to manufacturer, ensures back-pressure remains low, providing the optimum in terms of performance, whilst removing as many of the unwanted frequencies / 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, it's also the only cat-back exhaust available for your 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

If this item 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 soon at

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Simon H.
United Kingdom

Cat back exhaust

Excellent piece of engineering as always from mountune, should be fitted in the next few days

David J.
United Kingdom

Act Back Exhaust

Just fitted car now sounds as it should have originally not to loud just right once settles down. Tailpipe design much nicer to look at than the Mr 150 fitted to my son's Fiesta Metal a while ago. Next stop 215 upgrade brilliant Many Thanks.

Neil Scott


Ordered the catback exhaust along with the high flow intake hose and exhaust isolators, after already having the MP215 installed a while back. I don't think the car needs much more in the way of mods as it's a daily driver. Got my eye on the lower front spoiler though - and that will be it! Easy ordering and delivery to local garage was prompt. Ordered this product as it is warranty-friendly and a high-quality designed product and likely to give high performance and relatively subtle sound. So far - 4 days after fitting - I have not been disappointed. The exhaust sounds great, whether idling, manouvering, or accelerating. Lovely deep boom and burbles also at times. Purrs nicely on idle too. Some say it conflicts with the symposer, but I am loving the combination of the two. The symposer just seems to add a rasp/roar to the exhaust noise. This has significantly altered the character of the car, but in a subtle way. Very pleased so far!

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