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28 reviews


Iridium Spark Plug Set [Mk3 Focus RS]

EcoBoost engines running substantially higher boost pressure or increased levels of tuning compared to the OE power output can experience reduced spark plug life resulting in lower engine performance, misfires and rough idle.

Increased wear is typically seen in the form of increased spark plug gap and degradation of the electrode. Using spark plugs that are optimised for increased power ensures maximum performance.

Extensive in-market validation at extreme boost / cylinder pressures was undertaken to ensure optimal performance was achieved, whilst also making sure  reliability and drivability wasn't compromised in colder ambients.

Each set is supplied pre-gapped by mountune to optimise the setting and allow for easier end-user installation. 

The NGK LTR71X-II is one step colder than the original spark plug.

Focus RS 2016-2018

  • Smoother acceleration
  • Perfect for high boost applications
  • Supplied pre-gapped by mountune

Please note:Supplied in a pack of 4 plugs.

Customer Reviews
5.0 Based on 28 Reviews
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Filter Reviews:
    douglas m.
    United Kingdom United Kingdom
    Spark plugs

    Easy to fit with correct tools

    Alejandro S.
    Spain Spain

    La calidad de las piezas mejoradas es a simple vista totalmente superior a las de fabrica. La experiencia es inmejorable, me siento mucho mas seguro desde que tengo piezas mountune instaladas en mi Focus RS! Gracias por dedicar vuestra experiencia para mejorar nuestros sueños!

    Trevor C.
    United Kingdom United Kingdom

    Easy fitment & seems to smooth cold start warm up lumpiness