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Breather Plate

The mountune Breather Plate for mk3 Focus ST directly replaces the original engine block plate and features a 100% increase in baffle surface area over the original part. The increase in baffle surface area allows more crankcase vent vapour to be trapped and remain in the crankcase where it belongs. Additionally, the route the oil vapour takes on its way to the intake manifold is significantly increased through the baffles resulting in an increase of deflection area. At each deflection point, additional oil is removed from the vapour.

Installation is easy, and while not required, the mountune Breather Plate can be used with many catch can systems on the market. This part is a must for high boost, high performance applications.


  • Designed and optimised for modified 2.0-litre EcoBoost engines
  • Direct replacement
  • Easy installation
  • Machined from solid aluminum with precision steel baffles
  • Essential addition for modified engines


Engines create oil vapour from the crankcase and cylinder head, which is usually recycled back through the air intake system. This vapour can create a buildup of carbon deposits on the intake valve and can lead to reduced engine performance.

Additionally, over a period of time the oil vapour can accumulate on the intake hoses, turbocharger, intercooler and intake tract, slowing airflow and thereby reducing performance. For optimised engine performance, the oil should be removed from the vapour before it reaches the engine’s intake system.

Customer Reviews

4.8 Based on 11 Reviews
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Filter Reviews:
    Neil C.

    Quality item and worthwhile

    Had this fitted by Mountune at the same time as MP275 upgrade, charge pipes and cat back exhaust. Hoping to keep the car for as long as I can so hopefully should be beneficial over time, also a far higher quality item than the original, seems a sensible purchase, shame you can’t really see it.

    Stuart R.
    United Kingdom

    MK3 focus ST engine block breather plate

    No problems Easy job took around two hours at a slow And careful pace Quality item


    Breather plate

    Excellent bit of kit and fits better than original Shame you can't see it