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10 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 10 Reviews
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Filter Reviews:
    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.

    Richard G.
    United Kingdom United Kingdom

    Beautifully engineered

    Item arrived fast and very well presented, exhaust very well protected by foam, Followed the downloadable fitting instructions. Very easy to follow and all parts pictured, anyone with basic engineering skills or knowledge.. car doesn’t sound massively different, but it does sound better, the pops and bangs sound totally different, in a good way, no drown on motorway, all in all a very good bit of kit. I imagine with the Downpipe, Sports GPF and the m365 map, it’s going to sound very good indeed !

    mountune GPF-back Exhaust [Mk4 Focus ST] Review
    United Kingdom United Kingdom

    Excellent additions

    I had the M330 and GPF back exhaust fitted by Fred and I'm very pleased with the results! The exhaust fits perfectly and adds a gruff tone to the engine inside and outside of the car, but without any drone in the cabin at all. The carbon tips suit the car perfectly imo and the whole thing looks factory standard. Excellent experience all round!

    mountune GPF-back Exhaust [Mk4 Focus ST] Reviewmountune GPF-back Exhaust [Mk4 Focus ST] Review