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12 reviews


GPF-back Exhaust [Mk4 Focus ST]

Trim Finish

The mountune GPF-back exhaust for the Mk4 Focus ST adds a noteworthy boost to audible performance, reduces back-pressure and enhances vehicle aesthetics.

Constructed from 304 stainless steel, the 3" bore system improves vehicle performance - particularly once power output has been raised, thanks to the low back-pressure design, whilst the carefully engineered internal muffler ensures this system remains free from intrusive cabin boom, whilst delivering an addictive soundtrack.

Also available with either a polished or carbon fibre trim option to suit your individual preference:

Available for both Hatchback and Wagon models.


For the first time in our Ford range, we're offering either a polished stainless, or matt carbon fibre 4" tailpipe option, so as well as a boost in performance and sound, you can also tailor the aesthetic enhancement too.

Customer Reviews
5.0 Based on 12 Reviews
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Filter Reviews:
    Andre L.
    Norway Norway

    Gpf-- back exhaust focus st mk4

    very happy with the sound and what it looks like on the car. was easy to assemble. im verry happy

    mountune GPF-back Exhaust [Mk4 Focus ST] Reviewmountune GPF-back Exhaust [Mk4 Focus ST] Review
    Alex B.
    United Kingdom United Kingdom

    Awesome bit of kit

    Since I live close to Mountune HQ I decided to pick this up in person. I fitted it a day later. It only took me about 1.5 hours and the instructions are very clear and concise. Revs are a little louder and pops and bangs are deeper and more full. Very enjoyable when you want to put your foot down and still subtle enough when driving normally. I chose the chrome tips and they look amazing. Don't think twice about getting this cat-back.

    Laurens J.
    Belgium Belgium

    Aggression and elegance

    Got this fitted together with the air filter and the difference in driving quality was immediate. Very pleased with the engineering of this piece. The sound is considerably deeper, especially on start-up. Sounds much better in- and outside the cabin on hard pulls. Engine roar seems louder, but without cabin drone. Pops and bangs are slightly more frequent. Definitely makes you want to put the foot down more often. Ultimately it still offers elegance in drive mode, so it's up to you which side of the beast you want today. Got the carbon tips for style points. Would recommend.