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Iridium Spark Plug Set - 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 2016-2017

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

Please note:Supplied in a pack of 4 plugs.

Customer Reviews
5 Based on 25 Reviews
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Filter Reviews:
    United Kingdom United Kingdom
    Vroom, vroom

    Easy to install. Nothing really noticeable over the Stock spark plugs at low speed but, once moving - acceleration, performance improves. Fitted as a precursor to my 3rd Service. Very happy & totally recommended especially running FPM375 - 400R etc. MAGIC MOUNTUNE DOES IT AGAIN !!

    F J.
    Spain Spain
    Muy buen producto

    Excelente calidad como siempre

    Gordon S.
    United Kingdom United Kingdom
    Worth the buy!

    After looking at new upgraded spark plugs and seeing the reviews on here and also that they come pre gapped ready to fit. I made the purchase and what a difference in the RS mk3, it runs so much smoother, on idle and through the gears. It gives me peace of mind running extra power and delivers it much better, feels a lot faster! They do exactly as it says. I can't rate these plugs enough, I would highly recommend for the price and ease of fitting.